mastering times tables- compensate
TRANSCRIPT
Number Sense X
A. Box August 2015
If you’re like me, you probably find it hard mastering all of your times tables.
Hey there!
So, you’re trying
to master multiplication,
huh?
…you’re actually better off knowing the tricks to WORK OUT your tables.
But the good news is…
If you can WORK OUT tables using your number knowledge, you UNDERSTAND what the table means...
…and this skill is MORE IMPORTANT than simply remembering all of them.
A. Box August 2015
You can use TABLES YOU KNOW to out the ones you don’t.
If you can WORK OUT tables using your number knowledge, you UNDERSTAND what the table means.
Remember this strategy?
Ask yourself…
7 x 10 = 70 7 x 8
You Need to Figure Out… What’s close by
that you know? How do they relate?
Ask yourself…
8 x 7 7 x 8
is the same as(10x7) – (2x7)
70 - 1470 – 14 = 56
7 x 8 = 56
8 x 7 = 56
so 10 x 7 = 708 x 7
Compensation strategy
A. Box August 2015
Use TABLES YOU KNOW to out the ones you don’t.
Let’s try another.
Ask yourself…
6 x 11 = 66 6 x 12
You Need to Figure Out… What’s close by
that you know?How do they
relate?
Ask yourself…
12 x 6 is the same as(6x11) + (6x1)
66 + 6
66 + 6 = 726 x 12 = 72
12 x 6 = 72
so
6 x 12
11 x 6 = 66
Compensation strategy
A. Box August 2015
Use TABLES YOU KNOW to out the ones you don’t.
Let’s try another.
Ask yourself…
10 x 6 = 60 9 x 6
You Need to Figure Out… What’s close by
that you know?How do they
relate?
Ask yourself…
6 x 9 is the same as(10x6) - (1x6)
60 - 6
60 - 6 = 549 x 6 = 54
6 x 9 = 54
so
9 x 6
6 x 10 = 60
Compensation strategy
A. Box August 2015
For those who have mastered all their tables, this strategy can be used beyond 12 x 12.
Ask yourself…
15 x 10 = 150 15 x 9
You Need to Figure Out… What’s close by
that you know? How do they relate?
Ask yourself…
9 x 15 is the same as
(10 x 15) - (1x15)
150 - 15150 - 15 = 135
15 x 9 = 135
9 x 15 = 135
so
15 x 910 x 15 = 150
Compensation strategy
A. Box August 2015
Let’s try another.
Ask yourself…
16 x 10 = 160 16 x 8
You Need to Figure Out… What’s close by
that you know? How do they relate?
Ask yourself…
8 x 16 is the same as
(10 x 16) - (2x16)
160 - 32160 - 32 = 128
16 x 8 = 128
8 x 16 = 128
so
16 x 810 x 16 = 160
Compensation strategy
One more together…
Ask yourself…
20 x 7 = 140 19 x 7
You Need to Figure Out… What’s close by
that you know? How do they relate?
Ask yourself…
7 x 19 is the same as
(20 x 7) - (1x7)
140 - 7140 - 7 = 133
19 x 7 = 133
7 x 19 = 133
so
19 x 77 x 20 = 140
Compensation strategy
Your Turn:
19 x 96 x 14
…work on your own or in a pair to solve…Using the
COMPENSATION
STRATEGY…
…any or all of the following:
7 x 18 7 x 912 x 8
13 x 9 18 x 6 14 x 9
14 x 11
Compensation strategy
Send me some photos through Showbie, Number Tricks of your workings.