Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 402 · 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 24 × 63 = 1519 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 212 + 762 = 974 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 35 × 22 = 761 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 750 + 985 = 1735 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 53 × 63 = 3344 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 24 × 59 = 1414 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 288 + 949 = 1237 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 514 + 802 = 1316 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 79 × 78 = 6162 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 642 + 723 = 1365 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 927 + 696 = 1623 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 32 × 90 = 2888 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 99 × 99 = 9801 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 318 + 559 = 875 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 21 × 71 = 1491 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 31 × 35 = 1085 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 28 × 43 = 1206 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 131 + 708 = 830 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 34 × 99 = 3368 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 601 + 446 = 1038 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 31 × 53 = 1645 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 220 + 534 = 759 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 383 + 330 = 713 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 85 × 62 = 5270 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 377 + 589 = 966 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 84 × 32 = 2688 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 98 × 15 = 1476 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 66 × 81 = 5346 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 571 + 901 = 1465 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 464 + 735 = 1202 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 38 × 42 = 1596 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 41 × 34 = 1394 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 78 × 78 = 6084 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 494 + 725 = 1219 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 45 × 34 = 1532 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 130 + 780 = 910 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 54 × 87 = 4697 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 14 × 26 = 364 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 15 × 14 = 204 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 274 + 449 = 723 right or wrong? (a) Wrong (b) Right

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