Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 168 · 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 736 + 937 = 1664 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 540 + 201 = 750 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 44 × 68 = 2986 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 920 + 278 = 1199 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 452 + 225 = 677 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 96 × 93 = 8928 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 35 × 73 = 2555 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 41 × 50 = 2050 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 757 + 167 = 924 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 54 × 27 = 1458 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 18 × 79 = 1422 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 57 × 73 = 4159 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 275 + 112 = 387 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 902 + 153 = 1055 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 835 + 221 = 1047 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 987 + 905 = 1900 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 15 × 53 = 794 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 29 × 86 = 2495 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 592 + 440 = 1029 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 68 × 24 = 1628 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 84 × 89 = 7476 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 88 × 79 = 6952 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 57 × 45 = 2567 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 443 + 364 = 801 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 483 + 575 = 1058 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 21 × 52 = 1092 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 24 × 75 = 1800 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 15 × 29 = 429 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 53 × 83 = 4407 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 542 + 380 = 920 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 221 + 354 = 566 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 252 + 287 = 530 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 66 × 55 = 3627 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 52 × 18 = 936 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 64 × 30 = 1916 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 64 × 73 = 4678 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 307 + 787 = 1085 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 585 + 505 = 1088 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 35 × 47 = 1645 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 15 × 64 = 960 right or wrong? (a) Right (b) Wrong

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