Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 295 · 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 684 + 674 = 1366 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 203 + 431 = 634 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 14 × 36 = 504 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 74 × 63 = 4662 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 145 + 270 = 415 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 68 × 35 = 2382 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 65 × 34 = 2210 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 916 + 430 = 1340 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 24 × 61 = 1464 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 246 + 424 = 670 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 94 × 53 = 4991 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 38 × 52 = 1976 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 93 × 97 = 9021 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 137 + 648 = 777 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 392 + 919 = 1311 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 408 + 688 = 1096 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 133 + 915 = 1050 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 788 + 524 = 1312 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 599 + 271 = 870 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 591 + 595 = 1186 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 17 × 79 = 1350 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 672 + 901 = 1573 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 64 × 27 = 1731 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 73 × 94 = 6862 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 21 × 87 = 1827 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 737 + 615 = 1352 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 129 + 143 = 272 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 78 × 46 = 3589 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 199 + 115 = 314 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 778 + 646 = 1415 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 85 × 61 = 5182 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 813 + 844 = 1657 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 370 + 405 = 775 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 30 × 74 = 2218 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 298 + 145 = 438 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 52 × 55 = 2860 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 954 + 943 = 1897 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 424 + 547 = 971 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 25 × 59 = 1469 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 23 × 97 = 2231 right or wrong? (a) Right (b) Wrong

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