Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 826 · 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 15 × 54 = 813 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 899 + 472 = 1362 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 19 × 19 = 361 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 88 × 43 = 3780 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 13 × 60 = 780 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 420 + 184 = 605 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 139 + 281 = 416 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 56 × 29 = 1620 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 98 × 44 = 4303 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 544 + 433 = 975 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 62 × 80 = 4964 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 527 + 408 = 942 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 622 + 604 = 1231 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 70 × 24 = 1680 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 31 × 59 = 1832 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 375 + 263 = 644 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 23 × 43 = 989 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 74 × 75 = 5546 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 258 + 116 = 381 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 67 × 27 = 1809 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 680 + 452 = 1132 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 41 × 53 = 2175 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 146 + 113 = 259 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 26 × 71 = 1846 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 43 × 31 = 1333 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 33 × 68 = 2244 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 23 × 19 = 437 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 920 + 491 = 1411 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 471 + 221 = 697 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 875 + 328 = 1198 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 81 × 89 = 7209 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 52 × 75 = 3905 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 465 + 147 = 611 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 36 × 55 = 1978 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 322 + 434 = 756 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 58 × 57 = 3306 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 65 × 29 = 1892 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 98 × 41 = 4018 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 39 × 74 = 2886 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 71 × 47 = 3337 right or wrong? (a) Right (b) Wrong

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