Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 124 · 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 636 + 311 = 944 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 16 × 70 = 1123 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 336 + 225 = 561 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 66 × 16 = 1056 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 672 + 675 = 1342 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 201 + 481 = 691 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 662 + 285 = 947 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 918 + 596 = 1517 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 83 × 90 = 7470 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 96 × 54 = 5178 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 17 × 72 = 1224 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 79 × 14 = 1106 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 23 × 86 = 1971 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 87 × 45 = 3915 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 79 × 16 = 1261 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 22 × 58 = 1274 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 38 × 86 = 3262 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 12 × 29 = 357 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 44 × 47 = 2073 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 328 + 552 = 889 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 15 × 49 = 735 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 75 × 22 = 1650 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 92 × 82 = 7536 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 865 + 683 = 1548 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 200 + 547 = 745 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 58 × 46 = 2671 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 509 + 248 = 765 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 70 × 80 = 5591 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 84 × 99 = 8319 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 991 + 110 = 1096 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 99 × 98 = 9702 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 20 × 21 = 420 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 514 + 293 = 800 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 62 × 44 = 2728 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 74 × 53 = 3913 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 64 × 41 = 2630 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 493 + 187 = 680 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 93 × 81 = 7533 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 82 × 73 = 5986 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 87 × 30 = 2610 right or wrong? (a) Wrong (b) Right

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