Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 499 · 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 716 + 959 = 1672 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 54 × 64 = 3456 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 450 + 808 = 1260 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 22 × 87 = 1911 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 811 + 635 = 1446 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 41 × 78 = 3198 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 531 + 277 = 808 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 20 × 86 = 1718 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 25 × 35 = 875 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 97 × 93 = 9021 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 608 + 991 = 1596 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 280 + 207 = 478 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 15 × 26 = 390 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 56 × 47 = 2632 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 19 × 61 = 1159 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 50 × 36 = 1805 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 36 × 94 = 3384 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 62 × 25 = 1550 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 92 × 15 = 1380 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 31 × 99 = 3060 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 342 + 944 = 1286 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 437 + 597 = 1034 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 544 + 805 = 1345 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 888 + 119 = 1016 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 56 × 85 = 4760 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 12 × 77 = 925 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 369 + 157 = 525 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 12 × 94 = 1128 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 26 × 30 = 780 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 85 × 67 = 5691 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 689 + 679 = 1368 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 48 × 20 = 960 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 97 × 42 = 4074 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 47 × 91 = 4277 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 74 × 73 = 5402 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 29 × 71 = 2064 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 43 × 93 = 3999 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 445 + 499 = 953 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 29 × 71 = 2056 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 77 × 76 = 5852 right or wrong? (a) Right (b) Wrong

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