Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 403 · 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 992 + 695 = 1687 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 75 × 87 = 6525 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 981 + 547 = 1528 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 662 + 141 = 803 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 573 + 211 = 784 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 61 × 46 = 2806 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 870 + 375 = 1244 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 54 × 93 = 5015 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 469 + 425 = 893 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 93 × 28 = 2602 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 320 + 313 = 625 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 302 + 383 = 676 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 812 + 627 = 1439 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 56 × 45 = 2514 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 34 × 15 = 509 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 721 + 785 = 1506 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 606 + 464 = 1069 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 16 × 72 = 1152 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 785 + 654 = 1439 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 24 × 20 = 480 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 34 × 18 = 612 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 584 + 171 = 763 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 258 + 608 = 866 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 73 × 99 = 7227 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 15 × 33 = 499 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 16 × 14 = 232 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 49 × 60 = 2940 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 953 + 497 = 1450 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 964 + 948 = 1912 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 54 × 75 = 4050 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 15 × 67 = 1005 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 882 + 785 = 1662 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 86 × 58 = 4988 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 372 + 643 = 1015 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 49 × 98 = 4802 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 36 × 32 = 1159 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 25 × 48 = 1200 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 71 × 22 = 1570 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 54 × 15 = 817 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 89 × 70 = 6230 right or wrong? (a) Wrong (b) Right

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