Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 654 · 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 26 × 28 = 728 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 54 × 74 = 3996 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 540 + 332 = 872 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 83 × 27 = 2241 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 349 + 800 = 1148 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 395 + 741 = 1136 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 28 × 79 = 2205 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 30 × 99 = 2976 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 74 × 30 = 2218 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 133 + 352 = 494 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 241 + 112 = 354 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 185 + 890 = 1074 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 716 + 813 = 1529 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 93 × 98 = 9114 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 71 × 81 = 5752 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 44 × 24 = 1056 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 13 × 86 = 1121 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 12 × 21 = 252 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 397 + 492 = 889 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 69 × 50 = 3450 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 60 × 42 = 2520 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 134 + 945 = 1079 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 473 + 879 = 1352 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 491 + 295 = 786 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 12 × 28 = 338 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 55 × 76 = 4172 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 45 × 56 = 2528 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 14 × 97 = 1358 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 52 × 19 = 989 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 719 + 337 = 1056 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 13 × 75 = 983 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 72 × 87 = 6264 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 84 × 92 = 7728 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 32 × 47 = 1507 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 21 × 64 = 1344 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 97 × 19 = 1849 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 89 × 12 = 1068 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 753 + 152 = 905 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 638 + 272 = 919 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 19 × 50 = 947 right or wrong? (a) Right (b) Wrong

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