Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 223 · 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 96 × 42 = 4023 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 38 × 51 = 1938 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 76 × 16 = 1216 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 15 × 39 = 585 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 97 × 20 = 1940 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 97 × 68 = 6591 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 92 × 16 = 1472 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 886 + 181 = 1067 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 78 × 63 = 4913 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 618 + 898 = 1516 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 807 + 882 = 1689 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 830 + 643 = 1471 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 93 × 23 = 2139 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 412 + 589 = 993 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 23 × 40 = 920 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 89 × 28 = 2492 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 72 × 77 = 5544 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 50 × 15 = 750 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 52 × 74 = 3839 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 30 × 56 = 1680 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 391 + 159 = 547 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 631 + 338 = 969 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 12 × 27 = 315 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 16 × 82 = 1306 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 859 + 259 = 1118 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 53 × 95 = 5044 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 66 × 52 = 3432 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 66 × 47 = 3102 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 448 + 261 = 709 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 543 + 928 = 1471 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 23 × 43 = 998 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 556 + 995 = 1551 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 32 × 79 = 2528 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 147 + 211 = 355 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 65 × 85 = 5525 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 666 + 554 = 1220 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 750 + 416 = 1173 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 98 × 72 = 7055 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 430 + 282 = 708 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 447 + 810 = 1257 right or wrong? (a) Right (b) Wrong

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