Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 574 · 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 66 × 67 = 4422 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 79 × 97 = 7668 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 33 × 37 = 1221 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 565 + 441 = 1006 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 940 + 306 = 1244 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 19 × 64 = 1220 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 265 + 716 = 981 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 82 × 92 = 7535 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 637 + 904 = 1541 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 506 + 602 = 1108 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 968 + 551 = 1519 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 72 × 14 = 1008 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 151 + 862 = 1013 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 325 + 473 = 799 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 621 + 807 = 1428 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 36 × 50 = 1800 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 46 × 94 = 4324 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 60 × 91 = 5467 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 58 × 48 = 2784 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 27 × 97 = 2612 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 66 × 26 = 1716 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 671 + 189 = 852 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 47 × 37 = 1730 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 51 × 46 = 2346 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 163 + 482 = 646 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 35 × 80 = 2804 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 52 × 78 = 4054 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 45 × 72 = 3240 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 93 × 82 = 7626 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 23 × 46 = 1058 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 73 × 37 = 2703 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 286 + 707 = 992 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 94 × 21 = 1974 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 15 × 55 = 825 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 71 × 27 = 1917 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 46 × 58 = 2668 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 208 + 323 = 531 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 828 + 228 = 1049 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 538 + 189 = 727 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 642 + 824 = 1468 right or wrong? (a) Wrong (b) Right

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