Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 132 · 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 256 + 413 = 660 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 80 × 62 = 4966 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 84 × 97 = 8141 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 59 × 76 = 4484 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 993 + 802 = 1795 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 36 × 14 = 496 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 418 + 223 = 641 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 24 × 35 = 840 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 84 × 54 = 4536 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 125 + 271 = 398 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 989 + 118 = 1107 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 943 + 792 = 1735 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 56 × 18 = 1008 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 459 + 506 = 965 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 622 + 173 = 795 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 23 × 87 = 2001 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 62 × 24 = 1488 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 857 + 894 = 1751 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 171 + 331 = 502 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 26 × 55 = 1430 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 224 + 799 = 1023 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 16 × 71 = 1136 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 123 + 805 = 926 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 151 + 443 = 594 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 723 + 663 = 1383 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 13 × 39 = 512 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 637 + 322 = 959 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 24 × 60 = 1440 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 24 × 56 = 1344 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 228 + 885 = 1113 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 27 × 82 = 2222 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 93 × 50 = 4650 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 159 + 155 = 311 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 14 × 22 = 308 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 98 × 25 = 2450 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 511 + 794 = 1305 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 47 × 89 = 4192 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 671 + 282 = 953 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 391 + 610 = 1001 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 29 × 37 = 1069 right or wrong? (a) Right (b) Wrong

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