Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 707 · 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 71 × 53 = 3763 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 673 + 880 = 1544 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 76 × 13 = 979 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 84 × 83 = 6972 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 874 + 735 = 1609 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 81 × 45 = 3642 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 95 × 26 = 2462 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 87 × 30 = 2610 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 110 + 822 = 932 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 37 × 53 = 1961 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 78 × 30 = 2335 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 335 + 160 = 496 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 94 × 45 = 4229 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 76 × 91 = 6916 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 40 × 89 = 3556 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 203 + 135 = 340 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 271 + 295 = 566 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 56 × 44 = 2464 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 560 + 603 = 1167 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 38 × 91 = 3458 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 99 × 22 = 2178 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 40 × 20 = 800 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 72 × 75 = 5400 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 148 + 176 = 324 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 21 × 20 = 421 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 71 × 49 = 3479 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 94 × 13 = 1227 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 648 + 335 = 990 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 86 × 75 = 6450 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 153 + 148 = 296 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 333 + 210 = 543 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 43 × 49 = 2107 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 242 + 650 = 895 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 88 × 66 = 5808 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 789 + 120 = 909 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 13 × 34 = 436 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 80 × 12 = 960 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 66 × 63 = 4156 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 188 + 282 = 470 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 12 × 34 = 408 right or wrong? (a) Wrong (b) Right

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