Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 892 · 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 223 + 621 = 844 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 583 + 203 = 781 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 790 + 491 = 1281 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 93 × 83 = 7719 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 38 × 86 = 3268 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 424 + 437 = 868 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 131 + 659 = 790 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 34 × 28 = 946 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 17 × 97 = 1654 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 68 × 90 = 6113 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 97 × 84 = 8141 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 570 + 126 = 690 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 56 × 32 = 1792 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 629 + 334 = 966 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 78 × 90 = 7020 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 368 + 798 = 1157 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 37 × 65 = 2405 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 89 × 83 = 7387 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 48 × 75 = 3609 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 14 × 95 = 1330 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 76 × 84 = 6393 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 257 + 173 = 428 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 421 + 142 = 563 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 22 × 17 = 383 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 906 + 397 = 1309 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 33 × 39 = 1287 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 913 + 829 = 1742 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 49 × 18 = 881 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 739 + 596 = 1335 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 252 + 245 = 497 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 517 + 744 = 1259 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 106 + 801 = 907 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 21 × 56 = 1176 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 921 + 306 = 1227 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 267 + 682 = 946 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 44 × 13 = 563 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 31 × 83 = 2571 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 507 + 385 = 892 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 45 × 92 = 4142 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 17 × 98 = 1663 right or wrong? (a) Wrong (b) Right

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