Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 197 · 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 89 × 22 = 1958 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 83 × 90 = 7472 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 14 × 26 = 364 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 524 + 446 = 970 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 702 + 662 = 1368 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 569 + 165 = 734 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 538 + 409 = 947 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 80 × 97 = 7752 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 30 × 56 = 1680 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 407 + 632 = 1039 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 889 + 174 = 1062 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 891 + 511 = 1402 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 579 + 159 = 738 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 12 × 75 = 903 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 48 × 23 = 1100 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 20 × 60 = 1200 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 69 × 21 = 1449 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 58 × 62 = 3596 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 415 + 450 = 865 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 50 × 94 = 4700 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 24 × 13 = 303 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 523 + 464 = 978 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 225 + 630 = 860 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 774 + 650 = 1424 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 566 + 419 = 985 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 27 × 76 = 2052 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 54 × 83 = 4482 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 518 + 536 = 1054 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 997 + 265 = 1260 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 45 × 80 = 3605 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 65 × 16 = 1040 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 793 + 423 = 1216 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 401 + 995 = 1395 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 804 + 630 = 1426 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 69 × 40 = 2755 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 521 + 853 = 1375 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 17 × 23 = 397 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 251 + 988 = 1239 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 31 × 50 = 1546 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 675 + 212 = 889 right or wrong? (a) Right (b) Wrong

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