Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 553 · 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 88 × 99 = 8712 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 56 × 43 = 2408 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 311 + 162 = 473 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 81 × 45 = 3643 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 80 × 71 = 5684 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 48 × 83 = 3984 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 22 × 14 = 303 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 86 × 71 = 6106 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 719 + 670 = 1389 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 325 + 299 = 620 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 309 + 539 = 839 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 38 × 34 = 1292 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 16 × 49 = 776 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 34 × 63 = 2136 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 820 + 513 = 1333 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 60 × 28 = 1680 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 95 × 27 = 2570 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 351 + 823 = 1166 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 71 × 15 = 1065 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 664 + 357 = 1024 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 76 × 89 = 6758 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 17 × 60 = 1020 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 79 × 48 = 3790 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 48 × 33 = 1591 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 943 + 495 = 1438 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 323 + 817 = 1140 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 159 + 602 = 761 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 34 × 75 = 2557 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 354 + 205 = 564 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 14 × 31 = 442 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 865 + 511 = 1376 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 298 + 166 = 464 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 35 × 55 = 1925 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 580 + 241 = 815 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 68 × 60 = 4080 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 36 × 47 = 1688 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 63 × 73 = 4599 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 230 + 446 = 681 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 928 + 730 = 1658 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 576 + 213 = 789 right or wrong? (a) Wrong (b) Right

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