Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 800 · 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 61 × 57 = 3480 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 264 + 962 = 1220 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 13 × 33 = 429 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 26 × 67 = 1742 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 677 + 383 = 1060 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 40 × 45 = 1800 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 761 + 327 = 1088 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 900 + 302 = 1202 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 95 × 75 = 7125 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 89 × 30 = 2672 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 886 + 206 = 1100 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 61 × 72 = 4387 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 489 + 632 = 1121 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 30 × 62 = 1860 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 75 × 76 = 5700 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 74 × 23 = 1710 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 35 × 88 = 3080 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 303 + 162 = 464 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 528 + 602 = 1131 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 58 × 18 = 1044 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 15 × 18 = 276 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 586 + 470 = 1056 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 611 + 673 = 1284 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 50 × 19 = 951 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 353 + 737 = 1085 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 50 × 68 = 3399 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 135 + 668 = 802 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 39 × 44 = 1716 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 163 + 691 = 845 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 25 × 22 = 553 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 77 × 85 = 6545 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 308 + 281 = 589 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 24 × 91 = 2181 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 75 × 64 = 4800 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 929 + 763 = 1694 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 32 × 61 = 1944 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 842 + 727 = 1569 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 952 + 918 = 1870 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 14 × 32 = 448 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 58 × 32 = 1856 right or wrong? (a) Wrong (b) Right

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