Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 188 · 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 64 × 69 = 4423 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 18 × 76 = 1372 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 448 + 693 = 1141 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 88 × 53 = 4664 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 27 × 20 = 540 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 621 + 355 = 983 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 41 × 78 = 3195 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 129 + 185 = 314 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 853 + 522 = 1375 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 274 + 319 = 593 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 125 + 458 = 583 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 557 + 493 = 1050 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 57 × 63 = 3591 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 74 × 15 = 1112 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 16 × 99 = 1584 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 574 + 954 = 1528 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 452 + 568 = 1022 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 72 × 71 = 5108 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 942 + 725 = 1667 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 254 + 821 = 1070 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 141 + 944 = 1085 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 18 × 74 = 1325 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 992 + 131 = 1118 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 572 + 221 = 793 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 50 × 48 = 2394 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 81 × 89 = 7209 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 65 × 83 = 5395 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 467 + 379 = 839 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 26 × 56 = 1456 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 55 × 18 = 990 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 416 + 596 = 1015 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 49 × 49 = 2407 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 33 × 92 = 3033 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 272 + 574 = 846 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 44 × 42 = 1844 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 64 × 53 = 3387 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 60 × 27 = 1620 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 335 + 409 = 750 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 689 + 903 = 1592 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 116 + 268 = 383 right or wrong? (a) Right (b) Wrong

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