Factors and multiples
List all the factors of 20
1, 20, 2, 10, 4, 5
500 ÷ 100
5
Solve 84 ÷ 4 using the halving strategy
84 ÷ 2 = 42 ÷ 2 = 21
Use doubling strategy to solve 23 x 4
23 x 2 = 46 x 2 = 92
7 x 5 + 20 ÷ 2
45
List the first 5 multiples of 6
12, 18, 24, 30, 36, 42
45 x 10
Solve 77 ÷ 5 using the round and divide strategy.
75 ÷ 5 = 15 r 2
42 x 2 = 84
add the zeros 84,000
102 =
100
What is the highest common factor of 24 and 36?
12
7.5 x 100
750
Use the algorithm to solve 169 ÷ 5
33 r 4
33.8
Solve 18 x 5 using the compensation strategy
20 x 5 = 100 - 5 - 5 = 90
8 - 4 + 2 x 10 + 12 =
36
solve 45 ÷ 9 using factors
45 ÷ 3 ÷ 3
15 ÷ 3 = 5
35.2 ÷ 100
0.352
Use the split strategy to solve 420 ÷ 3
(you can split the number 420 any way that makes it easier to solve!)
300 ÷ 3 = 100
120 ÷ 3 = 40
420 ÷ 3 = 140
Use factors to solve 50 x 28
50 x 4 x 7
50 x 4 = 200 x 7 = 1400
44 =
256
List all the factors of 45
1, 45, 3, 15, 5, 9
0.04 x 100
4
Use ratios to solve 35000 ÷ 5000
35 ÷ 5 = 7
Choose the best strategy you know to solve the problem and show your working out.
130 x 40 =
5200
10 - 2 x 4 + 53 + (3 x 4) - 10 =
129