Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 635 · 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 142 + 539 = 681 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 95 × 82 = 7790 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 77 × 62 = 4774 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 862 + 798 = 1660 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 24 × 82 = 1968 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 116 + 702 = 820 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 540 + 591 = 1127 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 957 + 278 = 1231 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 239 + 964 = 1203 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 86 × 27 = 2322 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 81 × 15 = 1217 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 51 × 39 = 1986 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 639 + 234 = 873 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 377 + 645 = 1016 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 564 + 185 = 749 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 12 × 28 = 333 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 76 × 27 = 2045 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 746 + 983 = 1732 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 95 × 37 = 3515 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 86 × 33 = 2838 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 12 × 76 = 910 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 83 × 22 = 1823 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 73 × 55 = 4012 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 28 × 28 = 791 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 263 + 599 = 859 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 86 × 59 = 5074 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 35 × 22 = 770 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 440 + 993 = 1433 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 335 + 998 = 1333 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 870 + 715 = 1585 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 81 × 20 = 1620 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 995 + 719 = 1714 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 212 + 419 = 631 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 445 + 714 = 1159 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 21 × 77 = 1617 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 43 × 50 = 2149 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 60 × 29 = 1740 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 259 + 239 = 490 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 55 × 91 = 5005 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 40 × 70 = 2805 right or wrong? (a) Wrong (b) Right

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