Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 823 · 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 113 + 520 = 635 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 776 + 537 = 1313 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 30 × 82 = 2460 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 328 + 816 = 1144 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 46 × 79 = 3632 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 880 + 938 = 1820 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 53 × 78 = 4134 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 46 × 86 = 3956 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 70 × 27 = 1890 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 72 × 64 = 4608 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 219 + 257 = 480 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 40 × 68 = 2718 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 74 × 14 = 1036 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 880 + 837 = 1714 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 899 + 821 = 1720 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 813 + 581 = 1393 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 24 × 35 = 840 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 63 × 22 = 1387 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 89 × 32 = 2851 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 277 + 719 = 996 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 781 + 941 = 1722 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 65 × 47 = 3050 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 97 × 43 = 4171 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 833 + 969 = 1805 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 63 × 24 = 1514 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 44 × 62 = 2730 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 30 × 79 = 2377 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 75 × 91 = 6826 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 82 × 96 = 7877 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 39 × 35 = 1364 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 149 + 215 = 356 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 28 × 28 = 784 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 29 × 90 = 2610 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 98 × 16 = 1560 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 41 × 26 = 1066 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 776 + 114 = 892 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 370 + 466 = 836 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 38 × 17 = 646 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 159 + 501 = 660 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 35 × 65 = 2275 right or wrong? (a) Right (b) Wrong

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