Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 995 · 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 283 + 209 = 492 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 16 × 48 = 763 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 310 + 924 = 1233 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 701 + 394 = 1101 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 683 + 587 = 1270 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 65 × 77 = 5002 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 40 × 70 = 2800 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 45 × 20 = 891 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 215 + 273 = 488 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 40 × 56 = 2240 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 270 + 454 = 724 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 149 + 410 = 559 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 24 × 12 = 288 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 435 + 331 = 763 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 360 + 932 = 1287 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 220 + 486 = 706 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 34 × 51 = 1734 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 14 × 37 = 527 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 19 × 76 = 1444 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 91 × 55 = 5006 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 40 × 81 = 3240 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 67 × 67 = 4489 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 769 + 877 = 1646 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 170 + 490 = 660 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 53 × 71 = 3758 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 119 + 732 = 844 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 647 + 479 = 1127 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 48 × 44 = 2121 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 667 + 126 = 793 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 93 × 71 = 6603 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 91 × 76 = 6915 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 256 + 387 = 643 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 78 × 96 = 7488 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 66 × 57 = 3762 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 12 × 91 = 1092 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 490 + 198 = 680 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 41 × 41 = 1679 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 85 × 90 = 7650 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 837 + 124 = 969 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 590 + 556 = 1146 right or wrong? (a) Wrong (b) Right

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