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Mental Math
Strand B – Grade 6
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Quick Addition and Subtraction
Use this strategy when no regrouping is needed.
Begin the calculation from the front end.
Example: 2.327 + 1.441
Think: 2 + 1 = 3, 3 + 4 = 7, 2 + 4 = 6, 7 + 1 = 8 which gives the answer 3.768.
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Quick Addition and Subtraction
7.406 + 2.5926.234 + 2.6048.947 – 2.2310.735 – 0.2144.234 + 2.755
32.107 + 10.8827.076 – 3.055
96.982 – 12.28112.295 + 7.703
100.236 + 300.543
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Quick Addition and Subtraction
12.479 – 1.236125.443 – 25.123
7.596 – 2.38131.208 + 2.721
5.9235 + 4.062117.5 – 2.1
46.256 + 42.61310.882 – 6.2212.314 + 2.6858.932 – 3.711
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Quick Multiplication and Division
Use this strategy when no regrouping is needed.
Begin at the front end.
Example: 52 x 3
Think: 150 + 6 = 156
Example: 640 ÷ 2
Think: 300 + 20 = 320
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Quick Multiplication and Division
423 x 243 x 2
142 x 212.3 x 31220 x 3
72 x 3803 x 3143 x 2
42 000 x 484 x 2
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Quick Multiplication and Division
360 ÷ 3105 ÷ 5490 ÷ 7328 ÷ 4
2107 ÷ 73612 ÷ 6420 ÷ 2426 ÷ 6505 ÷ 5
248 000 ÷ 8
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Multiplying and Dividing by 10, 100, and 1000
For this strategy, you need to keep track of how the place values have changed.
Multiplying by 10 increases all the place values of a number by one place
Multiplying by 100 increases all the place values of a number by two places.
Multiplying by 1000 increases all the place values of a number by three places.
Example: 1000 x 45Think: the 4 tens will increases to 40 thousands and the 5 ones will increase to 5 thousands; therefore, the answer is 45 000.
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Multiplying and Dividing by 10, 100, and 1000
10 x 5310 x 2092 x 10100 x 7
100 x 7410 x 3.38.3 x 10
100 x 2.27.54 x 10
100 x 0.12
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Multiplying and Dividing by 10, 100, and 1000100 x 8.38.36 x 10
100 x 0.411000 x 2.2
8.02 x 1000100 x 9.910 x 0.3
100 x 0.071000 x 43.80.04 x 1000
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Dividing by tenths (0.1), hundredths (0.01), and thousandths (0.001)
Dividing by tenths increases all the place values of a number by one place
Dividing by hundredths increases all the place values of a number by two places.
Dividing by thousandths increases all the place values of a number by three places.
Example: 3 0.4 ÷ 0.01
Think: the 4 tenths will increases to 4 tens, therefore the answer is 40.
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Dividing by tenths (0.1), hundredths (0.01), and thousandths (0.001)
5 ÷ 0.146 ÷ 0.10.5 ÷ 0.1
0.02 ÷ 0.114.5 ÷ 0.123 ÷ 0.12.2 ÷ 0.1425 ÷ 0.10.15 ÷ 0.1
253.1 ÷ 0.1
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Dividing by tenths (0.1), hundredths (0.01), and thousandths (0.001)
4 ÷ 0.011 ÷ 0.1
0.2 ÷ 0.010.8 ÷ 0.018.2 ÷ 0.017 ÷ 0.01
05 ÷ 0.010.1 ÷ 0.016.5 ÷ 0.01
17.5 ÷ 0.01
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Dividing by Ten, Hundred, and Thousand
Dividing by 10 decreases all the place values of a number by one place.
Dividing by 100 decreases all the place values of a number by two places.
Dividing by 1000 decreases all the place values of a number by three places.
Example: 7500 ÷ 100
Think: 7 thousands will decrease to 7 tens and the 5 hundreds will decrease to 5 ones; therefore, the answer is 75.
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Dividing by Ten, Hundred, and Thousand
80 ÷ 10420 ÷ 10
1200 ÷ 10700 ÷ 100
2400 ÷ 1007000 ÷ 1000
80 000 ÷ 10002000 ÷ 1000
60 ÷ 10790 ÷ 10
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Dividing by Ten, Hundred, and Thousand
96 000 ÷ 100013 000 ÷ 1000
100 ÷ 10360 ÷ 10
900 ÷ 1004000 ÷ 100
37 000 ÷ 10029 000 ÷ 1000
100 000 ÷ 1000750 000 ÷ 1000
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Think Multiplication when Dividing
Example: 60 ÷ 12Think: What times 12 is 60? -- ? X 12 = 60 (5)
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Think Multiplication when Dividing
920 ÷ 40240 ÷ 12880 ÷ 40
1470 ÷ 703600 ÷ 121260 ÷ 606000 ÷ 12660 ÷ 30690 ÷ 30650 ÷ 50
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Multiplication and Division of tenths, hundredths, and thousandths
Multiplying by 0.1 decreases all the place values of a umber by one place.
Multiplying by 0.01 decreases all the place values of a number by two places.
Dividing by 100 decreases all the place values of a number by two places.
Multiplying by 0.001 decreases all the place values of a number by three places.
Dividing by 1000 decreases all the place values of a number by three places.
Example: 5 x 0.01Think: the 5 ones will decrease to 5 hundredths, therefore the answer is 0.05
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Multiplication and Division of tenths, hundredths, and thousandths
3 x 0.112 x 0.1
406 x 0.10.1 x 100.1 x 3.2
330 x 0.0011.2 x 0.010.7 x 0.0110 x 0.00146 x 0.01
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Multiplication and Division of tenths, hundredths, and thousandths
400 ÷ 1004200 ÷ 1009700 ÷ 100900 ÷ 100
7600 ÷ 10082 000 ÷ 100066 000 ÷ 1000
430 000 ÷ 100098 000 ÷ 100070 000 ÷ 1000
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Compensation
Change one of the factors to a ten, hundred, or thousand, carry out the multiplication, and then adjust the answer to compensate for the change that was made.
This strategy could be carried out when one of the factors is near ten, hundred, or thousand.
Example: 6 x $4.98Think: 6 times 5 dollars less 6 x 2 cents, therefore $30 subtract $0.12 which is $29.88.
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Compensation
3.99 x 44.98 x 29.99 x 86.99 x 95.99 x 7
19.99 x 320.98 x 26.98 x 3
49.98 x 499.98 x 5
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Compensation
3.98 x 39.97 x 64.99 x 56.99 x 8
98.99 x 47.98 x 4
19.98 x 222.99 x 359.98 x 59.97 x 7
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Halving and Doubling
Halve one factor and double the other factor in order to get two new factors that are easier to calculate.
You may need to record some sub-steps.
Example: 42 x 50
Think: one-half of 42 is 21 and 50 doubled is 100; therefore, 21 x 100 is 2100.
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Halving and Doubling
500 x 8812 x 2.54.5 x 2.2140 x 3586 x 50
500 x 4618 x 2.5
0.5 x 120180 x 4550 x 28
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Halving and Doubling
52 x 502.5 x 223.5 x 2.2160 3564 x 500500 x 7086 x 2.51.5 x 6.6140 x 15500 x 22
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Front End Multiplication or the Distributive principle in 10s, 100s, and
1000s Find the product of the single-digit factor and
the digit in the highest place value of the second number, and add to this product a second sub-product.
Example: 62 x 3
Think: 3 times 6 tens is 18 tens, or 180; and 3 times 2 is 6; so 180 plus 6 is 186
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Front End Multiplication or the Distributive principle in 10s, 100s, and
1000s53 x 3
29 x 2
62 x 4
3 x 503
606 x 6
503 x 2
122 x 4
804 x 6
703 x 8
320 x 3
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Front End Multiplication or the Distributive principle in 10s, 100s, and
1000s3 x 4200
5 x 5100
2 x 4300
4 x 2100
2 x 4300
7 x 2100
6 x 3100
6 x 3200
4 x 4200
410 x 5
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Finding Compatible Factors
Look for pairs of factors whose product is a power of ten and re-associate the factors to make the overall calculation easier.
Sometimes this strategy involves factoring one of the factors to get a compatible.
Example: 25 x 63 x 4
Think: 4 times 25 is 100, and 100 times 63 is 6300.
Example: 25 x 28
Think: 28 (7x4) has 4 as a factor, so 4 times 25 is 100, and 100 times 7 is 700.
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Finding Compatible Factors
5 x 19 x 2500 x 86 x 2250 x 67 x 42 x 43 x 50
250 x 56 x 440 x 37 x 254 x 38 x 25
40 x 25 x 335000 x 9 x 22 x 78 x 500
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Finding Compatible Factors
25 x 3224 x 500250 x 850 x 25
250 x 1616 x 2500
12 x 25500 x 36 5000 x 668 x 500
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Partitioning the Dividend
Partition the dividend into two parts. Both parts need to be easily divided by the given divisor.
Look for ten, hundred or thousand that is an easy multiple of the divisor and that is close to, but less than, the given dividend.
Example: 372 ÷ 6
Think: (360 + 12) ÷ 6, so 60 + 2 = 62.
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Partitioning the Dividend
3150 ÷ 5248 ÷ 4432 ÷ 6
8280 ÷ 9224 ÷ 7344 ÷ 8
5110 ÷ 7504 ÷ 8
1720 ÷ 43320 ÷ 4
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Balancing for a Constant Quotient
Change a given division question to an equivalent question that will have the same quotient by multiplying both the divisor and the dividend by the same amount.
Example: 125 ÷ 5
Think: I could multiply both 5 and 125 by 2 to get 250 ÷ 10, which is easy to do. The answer is 25.
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Balancing for a Constant Quotient
120 ÷ 2.523.5 ÷ 0.5
140 ÷ 5110 ÷ 2.532.3 ÷ 0.5120 ÷ 25320 ÷ 540 ÷ 2.5
135 ÷ 0.51200 ÷ 25
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Estimation--Rounding
Estimate your answers before you use pencil/paper to calculate your answers.
“Ball park” or reasonable answers are very helpful when you need to get an answer quickly.
Use words such as: about, just about, between, a little more than, a little less than, close, close to and near.
Just work with the first digits.
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Estimation--Rounding
593 x 41879 x 22295 x 59687 x 52912 x 1187 x 371363 x 82658 x 66567 x 88972 x 87
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Estimation--Rounding
411 ÷ 49651 ÷ 79233 ÷ 29360 ÷ 71
810.3 ÷ 892601 ÷ 503494 ÷ 602689 ÷ 908220 ÷ 901717 ÷ 20
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Front End Addition, Subtraction, Division, and Multiplication Estimate to the nearest whole number. Work with the first and second digits.
Example: 0.093 + 4.236
Think: 0.1 + 4.2 = 4.3 (to the nearest tenth)
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Front End Addition, Subtraction, Division, and Multiplication
2.104 + 2.7060.914 + 0.2310.442 + 0.231
100.004 + 100.1233.146 + 2.736
15.3 – 10.10.321 – 0.0955.601 – 4.1234.312 – 0.98
12.001 – 9.807
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Front End Addition, Subtraction, Division, and Multiplication
87.956 x 86 x 43.3336 x 12.013
100.123 x 3202.273 x 8
735 ÷ 9182 ÷ 2735 ÷ 8
276.5 ÷ 91701 ÷ 2
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Adjusted Front End or Front End with Clustering You may need to use pencil/paper to record
part of the answer. Use the steps shown below.
Example: 93 x 41
Think: 90 x 40 is 40 groups of 9 tnes, or 3600; and 3 x 40 is 40 groups of 3, or 120; 3600 plus 120 is 3720
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Adjusted Front End or Front End with Clustering
6.1 x 23.447 x 2261 x 79
672 x 5886 x 39
222 x 21481 x 1958 x 49
584 x 78352 x 61
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Adjusted Front End or Front End with Clustering
38.2 x 5.943.1 x 4.148.3 x 3.273.3 x 4.157.2 x 6.991.2 x 1.955.1 x 5.163.1 x 2.184.3 x 6.187.3 x 6.2
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Doubling for Division
Round and double both the dividend and the divisor.
Example: 2223 ÷ 5
Think: 4448 ÷ 10 or about 445
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Doubling for Division
1333.97 ÷ 5243 ÷ 5
3212.11 ÷ 5403 ÷ 5
1343.97 ÷ 5231.95 ÷ 5
2222.89 ÷ 5250 ÷ 5
3698.55 ÷ 52546.23 ÷ 5
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Doubling for Division
524 ÷ 59635 ÷ 54887 ÷ 51236 ÷ 5565 ÷ 5897 ÷ 5
1237 ÷ 5931 ÷ 5
4592 ÷ 5369 ÷ 5