Thinking Skills & Heuristics
Mental Calculation
Division – Breaking Up Divisors
Find the value of 2880 ÷ 24.
STRATEGY
2880 ÷ 24= 2880 ÷ (2 × 12)
= (2880 ÷ 2) ÷ 12
= 1440 ÷ 12
= 120
[break up the divisor]
[divide the number by the first divisor]
[divide the result by the second divisor]
Do these division mentally.
5208 ÷ 24 =
2
2400 ÷ 25 =
7
4704 ÷ 56 =
3
3996 ÷ 36 =
8
7744 ÷ 64 =
4
3800 ÷ 40 =
9
4263 ÷ 49 =
5
4452 ÷ 42 =
10 5096 ÷ 28 =
3 111
6
2 96
1620 ÷ 18 =
1 90
1
4 95
5 106
6 217
7 84
8 121
9 87
10 182
Answers:
Adapted:
Mental Mathematics Book 5
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