Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 606 · 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 32 × 30 = 955 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 93 × 76 = 7061 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 787 + 267 = 1054 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 480 + 512 = 992 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 79 × 82 = 6478 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 74 × 24 = 1772 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 982 + 578 = 1560 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 78 × 44 = 3431 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 994 + 142 = 1130 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 80 × 30 = 2400 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 69 × 40 = 2760 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 15 × 42 = 630 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 354 + 163 = 510 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 83 × 48 = 3979 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 807 + 966 = 1777 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 230 + 983 = 1213 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 17 × 60 = 1020 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 46 × 38 = 1748 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 851 + 282 = 1133 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 842 + 128 = 973 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 48 × 83 = 3984 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 82 × 25 = 2048 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 37 × 64 = 2368 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 94 × 33 = 3102 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 977 + 254 = 1231 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 83 × 24 = 1985 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 480 + 890 = 1363 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 77 × 50 = 3852 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 99 × 51 = 5047 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 64 × 81 = 5184 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 48 × 27 = 1295 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 412 + 298 = 702 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 46 × 16 = 741 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 32 × 27 = 864 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 68 × 41 = 2788 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 881 + 482 = 1358 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 36 × 87 = 3132 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 70 × 64 = 4489 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 383 + 859 = 1238 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 397 + 248 = 645 right or wrong? (a) Wrong (b) Right

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