Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 577 · 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 202 + 556 = 758 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 914 + 921 = 1835 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 96 × 51 = 4896 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 71 × 71 = 5041 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 19 × 40 = 760 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 45 × 22 = 997 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 341 + 497 = 847 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 569 + 561 = 1139 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 29 × 57 = 1653 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 879 + 876 = 1763 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 646 + 539 = 1190 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 40 × 33 = 1320 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 62 × 84 = 5208 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 65 × 64 = 4160 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 22 × 89 = 1958 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 522 + 968 = 1492 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 215 + 196 = 411 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 722 + 996 = 1718 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 24 × 75 = 1793 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 108 + 155 = 270 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 71 × 62 = 4402 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 53 × 84 = 4446 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 919 + 389 = 1311 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 402 + 998 = 1405 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 762 + 123 = 876 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 88 × 21 = 1848 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 737 + 108 = 845 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 67 × 17 = 1141 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 50 × 99 = 4950 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 37 × 35 = 1295 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 16 × 47 = 745 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 70 × 93 = 6507 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 35 × 89 = 3115 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 605 + 314 = 919 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 93 × 38 = 3527 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 911 + 840 = 1746 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 325 + 548 = 875 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 703 + 137 = 840 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 26 × 14 = 364 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 56 × 16 = 896 right or wrong? (a) Right (b) Wrong

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