Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 383 · 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 621 + 720 = 1332 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 21 × 29 = 618 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 388 + 247 = 632 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 949 + 512 = 1467 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 956 + 528 = 1492 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 42 × 96 = 4040 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 93 × 93 = 8649 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 224 + 549 = 771 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 29 × 52 = 1508 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 778 + 402 = 1187 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 97 × 30 = 2910 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 516 + 561 = 1079 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 26 × 37 = 956 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 69 × 25 = 1727 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 42 × 84 = 3530 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 30 × 64 = 1923 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 206 + 278 = 484 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 292 + 370 = 662 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 31 × 12 = 372 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 122 + 612 = 734 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 306 + 539 = 849 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 25 × 83 = 2075 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 636 + 724 = 1351 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 65 × 17 = 1105 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 53 × 69 = 3658 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 583 + 238 = 827 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 956 + 298 = 1259 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 23 × 25 = 576 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 60 × 84 = 5037 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 21 × 26 = 546 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 896 + 588 = 1489 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 71 × 60 = 4260 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 292 + 908 = 1200 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 768 + 448 = 1210 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 18 × 19 = 336 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 451 + 308 = 759 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 98 × 81 = 7938 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 62 × 30 = 1856 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 92 × 92 = 8467 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 719 + 905 = 1620 right or wrong? (a) Right (b) Wrong

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