Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 136 · 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 444 + 914 = 1358 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 115 + 233 = 348 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 733 + 906 = 1639 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 226 + 448 = 677 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 69 × 32 = 2208 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 65 × 98 = 6372 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 977 + 204 = 1181 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 768 + 159 = 927 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 601 + 174 = 775 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 22 × 85 = 1870 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 109 + 440 = 544 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 31 × 31 = 967 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 116 + 407 = 523 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 40 × 31 = 1240 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 64 × 45 = 2889 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 116 + 898 = 1016 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 26 × 93 = 2418 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 715 + 505 = 1221 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 81 × 62 = 5031 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 192 + 516 = 708 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 870 + 396 = 1273 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 34 × 47 = 1589 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 294 + 896 = 1190 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 909 + 291 = 1197 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 41 × 37 = 1518 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 64 × 51 = 3256 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 79 × 56 = 4423 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 28 × 21 = 588 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 610 + 417 = 1027 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 603 + 162 = 763 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 429 + 290 = 717 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 99 × 40 = 3960 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 538 + 159 = 697 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 88 × 31 = 2728 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 611 + 858 = 1469 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 14 × 16 = 226 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 39 × 45 = 1755 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 586 + 134 = 720 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 421 + 430 = 854 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 50 × 94 = 4700 right or wrong? (a) Right (b) Wrong

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