Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 7 · 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 43 × 12 = 508 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 60 × 66 = 3960 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 174 + 626 = 800 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 203 + 321 = 524 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 46 × 22 = 1003 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 592 + 689 = 1281 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 64 × 41 = 2624 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 24 × 96 = 2298 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 255 + 948 = 1203 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 247 + 779 = 1023 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 269 + 188 = 457 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 745 + 312 = 1053 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 31 × 22 = 685 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 683 + 971 = 1654 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 87 × 32 = 2784 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 88 × 64 = 5641 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 888 + 116 = 997 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 27 × 81 = 2185 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 84 × 26 = 2189 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 58 × 53 = 3074 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 26 × 81 = 2106 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 24 × 39 = 936 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 39 × 49 = 1919 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 529 + 570 = 1099 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 63 × 88 = 5552 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 30 × 33 = 990 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 241 + 893 = 1141 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 117 + 592 = 709 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 13 × 93 = 1209 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 955 + 379 = 1330 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 974 + 711 = 1681 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 75 × 75 = 5625 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 873 + 577 = 1454 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 59 × 45 = 2652 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 94 × 78 = 7330 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 581 + 112 = 693 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 15 × 69 = 1035 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 98 × 53 = 5194 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 72 × 30 = 2160 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 22 × 59 = 1296 right or wrong? (a) Wrong (b) Right

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