Fast Division Tricks
Transform awkward divisions into easier equivalent calculations.
Divide by 5640 ÷ 5 = 128
640 × 2 = 1,280
1,280 ÷ 10 = 128
1,280 ÷ 10 = 128
Why: ÷5 is ×2 ÷10.
Divide by 25900 ÷ 25 = 36
900 × 4 = 3,600
3,600 ÷ 100 = 36
3,600 ÷ 100 = 36
Why: 25 × 4 = 100.
Divide by 501,250 ÷ 50 = 25
1,250 × 2 = 2,500
2,500 ÷ 100 = 25
2,500 ÷ 100 = 25
Why: 50 × 2 = 100.
Divide by 4156 ÷ 4 = 39
156 ÷ 2 = 78
78 ÷ 2 = 39
78 ÷ 2 = 39
Why: Dividing by 4 is halving twice.
Divide by 8296 ÷ 8 = 37
296 ÷ 2 = 148
÷2 = 74
÷2 = 37
÷2 = 74
÷2 = 37
Why: 8 = 2 × 2 × 2.