Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 67 · 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 785 + 170 = 958 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 499 + 409 = 910 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 811 + 428 = 1245 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 48 × 23 = 1104 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 481 + 188 = 669 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 148 + 664 = 812 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 730 + 546 = 1274 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 44 × 84 = 3698 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 19 × 39 = 748 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 289 + 240 = 529 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 775 + 580 = 1355 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 71 × 24 = 1699 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 25 × 81 = 2025 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 69 × 59 = 4071 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 742 + 950 = 1692 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 92 × 69 = 6348 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 70 × 37 = 2585 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 39 × 42 = 1643 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 65 × 92 = 5984 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 978 + 280 = 1266 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 40 × 47 = 1880 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 771 + 453 = 1223 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 161 + 563 = 724 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 62 × 65 = 4030 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 13 × 38 = 490 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 227 + 323 = 554 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 30 × 12 = 354 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 198 + 751 = 949 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 70 × 13 = 916 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 89 × 56 = 4992 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 51 × 20 = 1020 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 797 + 346 = 1143 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 210 + 499 = 707 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 273 + 545 = 818 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 401 + 258 = 667 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 54 × 56 = 3016 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 302 + 125 = 422 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 77 × 60 = 4620 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 549 + 709 = 1258 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 300 + 728 = 1033 right or wrong? (a) Wrong (b) Right

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