Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 647 · 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 876 + 912 = 1790 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 279 + 385 = 673 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 91 × 47 = 4285 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 40 × 20 = 805 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 221 + 167 = 396 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 93 × 79 = 7347 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 29 × 69 = 2000 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 21 × 86 = 1806 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 303 + 228 = 531 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 72 × 18 = 1290 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 755 + 822 = 1583 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 99 × 48 = 4756 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 72 × 97 = 6991 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 888 + 109 = 997 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 738 + 460 = 1194 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 452 + 726 = 1180 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 225 + 198 = 429 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 341 + 971 = 1304 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 533 + 596 = 1129 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 59 × 27 = 1585 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 789 + 189 = 986 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 29 × 74 = 2146 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 726 + 619 = 1341 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 46 × 41 = 1878 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 34 × 42 = 1430 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 95 × 53 = 5035 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 96 × 83 = 7968 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 61 × 67 = 4088 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 25 × 17 = 423 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 733 + 585 = 1324 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 23 × 64 = 1465 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 220 + 265 = 492 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 40 × 96 = 3838 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 26 × 38 = 988 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 27 × 63 = 1701 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 76 × 95 = 7228 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 97 × 25 = 2425 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 86 × 87 = 7482 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 19 × 62 = 1178 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 96 × 81 = 7776 right or wrong? (a) Right (b) Wrong

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