Level 2 PSLE The sum of two numbers is 88. One of the numbers is a multiple of 9. The other number is a factor of 21. What is the difference between the 2 numbers?
Number 1 + Number 2 = 88
Number 1 is a factor of 21.
Factors of 21: 1, 3, 7, 21
Number 2 is a multiple of 9.
To be a multiple of 9, Number 2 must have no remainder when divided by 9.
Number 1 |
Number 2 |
Is Number 2 is a multiple of 9? |
Is the remainder 0? |
21 |
88 - 21 = 67 |
67 ÷ 9 = 7 r 4 |
x |
7 |
88 - 7 = 81 |
81 ÷ 9 = 9 r 0 |
✓ |
Difference between the 2 numbers
= 81 - 7
= 74
Answer(s): 74