Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 689 · 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 88 × 19 = 1675 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 651 + 619 = 1270 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 968 + 261 = 1229 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 224 + 869 = 1093 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 380 + 906 = 1286 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 51 × 55 = 2807 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 871 + 646 = 1517 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 18 × 24 = 432 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 23 × 13 = 299 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 69 × 43 = 2971 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 78 × 20 = 1560 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 660 + 550 = 1213 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 13 × 60 = 780 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 44 × 97 = 4270 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 44 × 17 = 739 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 979 + 994 = 1973 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 202 + 540 = 742 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 65 × 14 = 909 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 66 × 99 = 6534 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 14 × 78 = 1092 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 36 × 94 = 3385 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 117 + 736 = 853 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 918 + 915 = 1825 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 698 + 558 = 1256 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 699 + 274 = 973 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 279 + 781 = 1060 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 475 + 461 = 936 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 95 × 30 = 2850 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 29 × 51 = 1488 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 88 × 70 = 6155 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 815 + 763 = 1578 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 88 × 39 = 3432 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 698 + 936 = 1634 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 634 + 274 = 908 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 149 + 415 = 557 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 915 + 201 = 1116 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 65 × 32 = 2073 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 299 + 311 = 610 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 921 + 397 = 1318 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 17 × 66 = 1125 right or wrong? (a) Right (b) Wrong

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