Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 449 · 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 764 + 632 = 1396 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 12 × 54 = 648 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 27 × 99 = 2673 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 266 + 629 = 895 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 36 × 20 = 718 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 772 + 580 = 1352 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 13 × 33 = 429 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 39 × 23 = 897 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 74 × 92 = 6808 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 182 + 853 = 1035 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 623 + 550 = 1173 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 195 + 947 = 1142 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 77 × 98 = 7551 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 87 × 52 = 4524 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 82 × 23 = 1886 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 247 + 612 = 859 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 762 + 314 = 1069 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 32 × 85 = 2712 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 27 × 44 = 1188 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 472 + 808 = 1280 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 85 × 56 = 4760 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 50 × 98 = 4900 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 450 + 154 = 604 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 624 + 606 = 1230 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 32 × 80 = 2558 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 858 + 216 = 1074 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 137 + 500 = 637 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 666 + 998 = 1667 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 30 × 68 = 2040 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 588 + 667 = 1255 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 555 + 769 = 1324 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 70 × 73 = 5110 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 24 × 64 = 1536 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 71 × 60 = 4267 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 22 × 92 = 2024 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 55 × 41 = 2255 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 87 × 12 = 1046 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 324 + 399 = 724 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 613 + 328 = 941 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 862 + 312 = 1165 right or wrong? (a) Wrong (b) Right

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