Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 229 · 40 questions

The trick (Last digits only): Multiply (or add) only the last digits of the two numbers. The last digit of that result is the last digit the answer must have. Different last digit → wrong for sure. Same last digit → it passes the check (work it out in full to be certain).

1. 1.Last-digit check: is 36 × 20 = 723 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 221 + 827 = 1048 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 191 + 175 = 366 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 504 + 323 = 827 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 99 × 67 = 6633 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 138 + 761 = 899 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 945 + 481 = 1418 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 553 + 179 = 732 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 358 + 230 = 582 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 767 + 589 = 1356 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 225 + 996 = 1221 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 66 × 60 = 3960 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 40 × 38 = 1519 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 88 × 87 = 7652 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 89 × 69 = 6141 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 395 + 826 = 1221 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 486 + 805 = 1291 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 28 × 91 = 2556 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 700 + 414 = 1112 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 97 × 34 = 3298 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 233 + 440 = 668 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 72 × 77 = 5548 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 79 × 36 = 2836 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 55 × 44 = 2420 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 77 × 45 = 3465 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 66 × 32 = 2112 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 44 × 14 = 611 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 14 × 48 = 672 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 681 + 976 = 1657 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 71 × 84 = 5964 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 133 + 268 = 400 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 696 + 242 = 929 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 98 × 33 = 3232 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 764 + 192 = 956 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 269 + 747 = 1016 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 392 + 832 = 1224 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 46 × 71 = 3272 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 228 + 734 = 959 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 350 + 425 = 774 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 314 + 114 = 424 right or wrong? (a) Right (b) Wrong

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