Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 98 · 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 793 + 360 = 1153 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 13 × 46 = 598 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 338 + 730 = 1064 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 84 × 50 = 4197 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 706 + 568 = 1274 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 32 × 95 = 3040 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 426 + 348 = 774 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 85 × 57 = 4848 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 300 + 912 = 1212 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 16 × 41 = 656 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 91 × 15 = 1365 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 204 + 672 = 874 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 110 + 188 = 298 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 91 × 80 = 7282 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 182 + 204 = 386 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 28 × 54 = 1505 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 465 + 107 = 572 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 586 + 728 = 1319 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 227 + 446 = 673 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 59 × 84 = 4951 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 47 × 95 = 4462 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 86 × 36 = 3094 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 125 + 161 = 288 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 86 × 66 = 5673 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 185 + 746 = 931 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 99 × 40 = 3960 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 397 + 787 = 1184 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 312 + 875 = 1187 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 94 × 86 = 8084 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 89 × 55 = 4887 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 260 + 579 = 839 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 42 × 85 = 3577 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 67 × 90 = 6030 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 46 × 91 = 4177 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 83 × 46 = 3812 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 59 × 96 = 5664 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 22 × 31 = 673 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 64 × 99 = 6339 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 123 + 931 = 1054 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 244 + 305 = 546 right or wrong? (a) Wrong (b) Right

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