Math 4 · Unit 3: Addition and subtraction of whole numbers · Cambridge Primary Maths Stage 4

Questions

1. 1. Is it always, sometimes or never true that when you add two numbers together you get an even number?

   • never true
   • sometimes true
   • always true
   • only for big numbers
   Check

2. 2. Look at the odd numbers in the grid. If you shade them all, what letter do they make?

   • T
   • H
   • U
   • E
   Check

3. 3. Each one is the sum of two odd numbers: 5 + 11, 23 + 19 and 101 + 5. Work them out, then complete: The sum of two odd numbers is always …

   • 16, 43, 107: odd
   • 16, 42, 106: odd
   • 15, 42, 106: even
   • 16, 42, 106: even
   Check

4. 4. Join each calculation to the correct answer.

   • odd + odd =
   • odd + even =
   • even + even =

   • odd
   • even
   • even
   Check

5. 5. Is it always, sometimes or never true that the sum of two odd numbers is even?

   • only if they are different
   • always true
   • never true
   • sometimes true
   Check

6. 6. Is it always, sometimes or never true that the sum of three odd numbers is even?

   • always true
   • never true
   • sometimes true
   • only for small numbers
   Check

7. 7. Each one is the sum of one odd number and one even number: 5 + 12, 23 + 20 and 101 + 10. Work them out, then complete: The sum of one odd number and one even number is always …

   • 17, 43, 111: even
   • 17, 43, 111: odd
   • 16, 43, 111: odd
   • 17, 42, 112: even
   Check

8. 8. Tick the 2 statements that are true.

   Tick all the right answers.

   • ☐ odd + even = odd
   • ☐ odd + odd = even
   • ☐ odd − odd = odd
   Check

9. 9. Leroy says, ‘I add two odd numbers and one even number and my answer is 33.’ Is Leroy correct?

   • Yes
   • No
   Check

10. 10. Mary says, 'The difference between two odd numbers is odd.' Is this always true, sometimes true or never true, and why?

    • Sometimes true: it is odd when the numbers are close.
    • Never true: taking one odd number from another leaves an even number, for example 9 − 3 = 6.
    • Never true: odd numbers cannot be subtracted.
    • Always true: odd numbers are bigger than even numbers.
    Check

11. 11. Work out 5 + 11, 22 + 19, 34 + 56, 213 + 35, 432 + 79 and 876 + 432. Then complete: the sum of two odd numbers is always …, the sum of two even numbers is always …, the sum of one odd and one even number is always … (in that order).

    • 16, 41, 90, 248, 511, 1308: even, even, odd
    • 16, 41, 90, 248, 511, 1308: even, odd, odd
    • 16, 41, 90, 238, 511, 1308: even, even, odd
    • 16, 41, 90, 248, 511, 1308: odd, even, even
    Check

12. 12. Tick the 2 statements that are true.

    Tick all the right answers.

    • ☐ even + even = even
    • ☐ odd + odd = odd
    • ☐ even − even = even
    • ☐ odd − odd = odd
    Check

13. 13. Four statements about odd and even numbers: one is wrong. Which one?

    • The sum of two odd numbers is 20.
    • The sum of three even numbers is 24.
    • The sum of two even numbers is 18.
    • The sum of three odd numbers is 22.
    Check

14. 14. Is it always, sometimes or never true that the sum of four even numbers will divide exactly by 4?

    • always true
    • only if they are the same
    • never true
    • sometimes true
    Check