round the number to the nearest 10 and add
Post on 30-Dec-2015
21 Views
Preview:
DESCRIPTION
TRANSCRIPT
1
Round The Number To The Nearest 10 And Add
1. 70 ------- 73 ----- 75 ------------- 80
2. 40 ----------------- 45 ------- 49 - 50 1
73 70
+ 49 +50
122 120
Answer : Actual - 122 Estimate - 120
2
Round The Number To The Nearest 100 And Add
1. 100 -------------- 150 ----154 ------- 200
2. 100 ------ 129 -- 150 ----------------- 200
1
154 200
+ 129 + 100
283 300Answer : Actual – 283 Estimate - 300
3
Round The Number To The Nearest 1000 And Add
1. 1000 ------------ 1500 ----1705 ------ 20002. 7000 ------------ 7500 --------7807--- 80003. 1000 ---1395 -- 1500 ----------------- 2000
1 1 1 1 1
31703 32000 + 47807 + 48000 + 11397 + 11000
90907 91000Answer : Actual – 90907 Estimate - 91000
4
Exercise
(a) Nearest 10
69 42 57
+ 78 + 37 + 74
. . .
(b) Nearest 100
4160 7358
+ 2397 + 5763
. .
5
Exercise
(c) Nearest 1000
26379 6942 1
+ 76689 + 43587
. .
6
ESTIMATING DIFFERENCES
7
Estimate the difference to the nearest 10 And Subtract
Solution-E.g. 8 12
1 9 2 1 9 0 - 1 6 8 - 1 7 0
0 2 4 0 2 0Ans: Actual-24 Estimate-20
8
Example 2
8 12
9 2 9 0 - 3 5 - 4 0
5 7 5 0Ans: Actual-57 Estimate-50
9
Estimate the difference to the nearest 100 And Subtract
Solution-E.g. 6 12 6 13
7 2 9 8 7 3 0 0 - 2 5 6 1 - 2 6 0 0
4 7 3 7 4 7 0 0 Ans: Actual-4737 Estimate-4700
10
Estimate the difference to the nearest 1000 And Subtract
Solution-E.g. 4 10
5 7 5 0 9 5 8 0 0 0- 4 1 3 9 9 - 4 1 0 0 0
1 6 1 1 0 1 7 0 0 0Ans:Actual-1610 Estimate-1700
11
Exercise
(a) Nearest ten9 1 8 5 6
- 6 8 - 1 3 9___ ____
(b) Nearest hundred6 1 5 8 4 6 7 2
- 4 4 2 9 - 1 0 8 5_____ _____
12
(c) Nearest thousands
4 5 6 5 0 - 2 4 7 5 6
_______
top related