Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 668 · 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 81 × 87 = 7047 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 541 + 506 = 1047 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 956 + 831 = 1788 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 63 × 80 = 5040 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 209 + 287 = 497 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 501 + 118 = 619 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 95 × 80 = 7600 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 43 × 77 = 3307 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 647 + 438 = 1085 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 90 × 37 = 3327 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 485 + 528 = 1013 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 757 + 963 = 1720 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 21 × 91 = 1911 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 44 × 75 = 3297 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 56 × 92 = 5152 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 48 × 91 = 4366 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 50 × 74 = 3700 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 774 + 145 = 919 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 131 + 147 = 278 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 33 × 17 = 556 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 50 × 19 = 950 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 84 × 33 = 2766 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 807 + 971 = 1778 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 54 × 83 = 4480 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 965 + 256 = 1214 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 878 + 741 = 1628 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 67 × 49 = 3283 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 16 × 71 = 1136 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 88 × 46 = 4048 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 62 × 37 = 2294 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 349 + 819 = 1164 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 122 + 474 = 589 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 83 × 44 = 3652 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 84 × 81 = 6810 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 61 × 72 = 4390 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 859 + 360 = 1219 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 36 × 99 = 3564 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 75 × 72 = 5409 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 548 + 854 = 1400 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 45 × 61 = 2745 right or wrong? (a) Right (b) Wrong

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