Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 909 · 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 563 + 155 = 721 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 85 × 56 = 4760 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 59 × 52 = 3066 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 166 + 431 = 598 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 32 × 70 = 2246 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 24 × 96 = 2304 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 461 + 670 = 1134 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 58 × 85 = 4930 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 205 + 945 = 1146 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 29 × 35 = 1018 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 52 × 28 = 1451 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 58 × 31 = 1805 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 732 + 152 = 884 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 58 × 76 = 4408 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 951 + 122 = 1071 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 90 × 20 = 1800 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 81 × 65 = 5265 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 214 + 303 = 517 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 36 × 13 = 469 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 95 × 66 = 6269 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 44 × 59 = 2596 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 68 × 30 = 2040 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 713 + 131 = 849 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 59 × 22 = 1298 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 52 × 79 = 4108 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 96 × 43 = 4121 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 72 × 57 = 4104 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 990 + 477 = 1465 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 72 × 49 = 3528 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 58 × 71 = 4118 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 220 + 178 = 392 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 71 × 81 = 5744 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 25 × 96 = 2400 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 44 × 31 = 1363 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 36 × 56 = 2009 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 209 + 471 = 680 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 22 × 20 = 440 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 693 + 528 = 1221 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 446 + 265 = 702 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 418 + 482 = 900 right or wrong? (a) Right (b) Wrong

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