Level 2 PSLE The sum of two numbers is 61. 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 = 61
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 |
61 - 21 = 40 |
40 ÷ 9 = 4 r 4 |
x |
7 |
61 - 7 = 54 |
54 ÷ 9 = 6 r 0 |
✓ |
Difference between the 2 numbers
= 54 - 7
= 47
Answer(s): 47