Math 3 · Unit 9: More addition and subtraction · Cambridge Primary Maths Stage 3

Questions

1. 1. 53 + 76 = ?

   • 1219
   • 139
   • 129
   • 119
   Check

2. 2. 65 + 54 = ?

   • 119
   • 109
   • 129
   • 1119
   Check

3. 3. 187 + 50 = ?

   • 227
   • 137
   • 192
   • 237
   Check

4. 4. 245 + 172 = ?

   • 417
   • 407
   • 3117
   • 317
   Check

5. 5. How many hundreds are there in one thousand?

   • 10
   • 1
   • 100
   • 1000
   Check

6. 6. Which addition needs regrouping of the tens?

   • 43 + 55
   • 34 + 52
   • 75 + 63
   • 28 + 61
   Check

7. 7. Which addition needs regrouping of the ones?

   • 46 + 31
   • 25 + 57
   • 34 + 52
   • 43 + 55
   Check

8. 8. When you add some tens to a 3-digit number, which digit never changes?

   • the ones digit
   • the tens digit
   • the hundreds digit
   Check

9. 9. 7 + 8 + 3 = ? (Find a complement of 10 first.)

   • 15
   • 18
   • 17
   • 21
   Check

10. 10. Nawaf adds three different single-digit numbers to make 18. Which set works?

    • 8, 6, 3
    • 9, 9, 0
    • 7, 5, 4
    • 9, 6, 3
    Check

11. 11. Estimate 375 + 321 + 283 by rounding to the nearest 100.

    • 300 + 300 + 200 = 800
    • 400 + 400 + 300 = 1100
    • 375 + 300 + 300 = 975
    • 400 + 300 + 300 = 1000
    Check

12. 12. 375 + 321 + 283 = ?

    • 879
    • 979
    • 989
    • 969
    Check

13. 13. Oditi adds a 3-digit number and some tens. Her total is 364. Which could be her numbers?

    • 324 + 40
    • 300 + 46
    • 354 + 20
    • 320 + 44
    Check

14. 14. 571 + 243 = ?

    • 804
    • 824
    • 714
    • 814
    Check

15. 15. Addition is commutative. This means …

    • you can only add two numbers
    • you can add numbers in any order
    • you must add from left to right
    • the answer changes with the order
    Check