Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 792 · 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 17 × 64 = 1088 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 50 × 76 = 3797 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 728 + 993 = 1714 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 903 + 479 = 1381 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 688 + 198 = 888 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 97 × 88 = 8530 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 15 × 31 = 463 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 113 + 445 = 558 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 72 × 30 = 2160 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 12 × 55 = 666 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 58 × 57 = 3303 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 37 × 82 = 3034 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 44 × 86 = 3784 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 555 + 689 = 1235 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 599 + 904 = 1503 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 643 + 398 = 1042 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 546 + 782 = 1328 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 82 × 23 = 1886 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 178 + 566 = 744 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 16 × 29 = 464 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 563 + 502 = 1065 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 28 × 36 = 1008 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 67 × 42 = 2818 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 568 + 268 = 836 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 42 × 49 = 2056 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 23 × 65 = 1495 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 561 + 157 = 718 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 82 × 15 = 1230 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 32 × 13 = 416 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 18 × 45 = 803 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 30 × 30 = 901 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 627 + 913 = 1540 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 305 + 728 = 1033 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 72 × 48 = 3456 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 803 + 447 = 1250 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 54 × 88 = 4752 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 31 × 84 = 2604 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 180 + 199 = 384 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 619 + 141 = 760 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 28 × 52 = 1456 right or wrong? (a) Right (b) Wrong

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