Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 118 · 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 68 × 80 = 5440 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 41 × 20 = 820 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 233 + 148 = 375 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 805 + 678 = 1483 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 31 × 86 = 2661 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 30 × 19 = 570 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 872 + 152 = 1026 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 36 × 90 = 3247 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 379 + 172 = 546 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 884 + 718 = 1600 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 73 × 82 = 5986 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 15 × 66 = 990 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 524 + 968 = 1492 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 72 × 31 = 2232 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 879 + 359 = 1238 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 147 + 946 = 1093 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 617 + 439 = 1056 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 457 + 170 = 627 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 266 + 506 = 772 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 812 + 614 = 1417 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 54 × 31 = 1674 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 206 + 340 = 546 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 95 × 23 = 2192 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 62 × 31 = 1914 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 28 × 13 = 364 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 58 × 78 = 4520 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 44 × 85 = 3740 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 59 × 24 = 1418 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 310 + 546 = 856 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 357 + 262 = 619 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 74 × 47 = 3474 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 816 + 364 = 1180 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 94 × 88 = 8272 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 75 × 43 = 3225 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 35 × 43 = 1505 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 64 × 81 = 5184 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 19 × 68 = 1295 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 335 + 596 = 927 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 85 × 56 = 4761 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 22 × 28 = 622 right or wrong? (a) Right (b) Wrong

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