Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 44 · 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 23 × 68 = 1567 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 36 × 54 = 1943 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 446 + 186 = 632 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 843 + 271 = 1110 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 770 + 308 = 1078 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 274 + 772 = 1054 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 14 × 99 = 1378 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 21 × 24 = 503 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 233 + 346 = 578 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 23 × 34 = 782 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 954 + 761 = 1715 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 28 × 86 = 2408 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 34 × 92 = 3128 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 27 × 27 = 726 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 626 + 577 = 1203 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 851 + 819 = 1672 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 162 + 743 = 905 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 629 + 408 = 1037 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 38 × 93 = 3526 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 52 × 92 = 4784 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 54 × 80 = 4318 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 655 + 713 = 1368 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 14 × 28 = 384 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 412 + 619 = 1023 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 86 × 14 = 1196 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 14 × 69 = 966 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 91 × 30 = 2730 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 864 + 969 = 1826 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 40 × 72 = 2878 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 56 × 12 = 677 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 13 × 83 = 1079 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 149 + 590 = 739 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 598 + 796 = 1394 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 41 × 27 = 1107 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 482 + 888 = 1370 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 307 + 902 = 1209 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 268 + 732 = 1000 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 270 + 457 = 721 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 107 + 800 = 907 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 118 + 574 = 700 right or wrong? (a) Right (b) Wrong

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