Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 484 · 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 212 + 496 = 708 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 430 + 159 = 589 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 90 × 28 = 2520 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 92 × 20 = 1831 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 68 × 20 = 1360 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 97 × 70 = 6790 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 113 + 512 = 625 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 79 × 83 = 6548 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 90 × 90 = 8100 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 52 × 20 = 1044 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 140 + 354 = 494 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 35 × 96 = 3366 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 37 × 25 = 925 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 23 × 53 = 1211 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 96 × 13 = 1248 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 94 × 18 = 1685 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 196 + 473 = 669 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 46 × 29 = 1329 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 394 + 708 = 1102 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 33 × 87 = 2871 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 716 + 590 = 1306 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 66 × 67 = 4422 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 255 + 170 = 425 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 75 × 96 = 7200 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 96 × 28 = 2688 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 302 + 228 = 530 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 51 × 48 = 2448 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 88 × 56 = 4928 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 23 × 38 = 874 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 858 + 692 = 1556 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 115 + 667 = 782 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 979 + 207 = 1186 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 480 + 243 = 723 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 131 + 580 = 715 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 31 × 54 = 1673 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 340 + 337 = 672 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 587 + 682 = 1269 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 189 + 750 = 936 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 48 × 98 = 4704 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 286 + 421 = 707 right or wrong? (a) Right (b) Wrong

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