Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 838 · 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 757 + 256 = 1013 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 377 + 248 = 617 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 257 + 126 = 383 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 548 + 264 = 812 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 56 × 55 = 3080 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 391 + 288 = 679 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 84 × 37 = 3112 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 95 × 31 = 2945 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 830 + 457 = 1282 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 69 × 99 = 6837 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 220 + 786 = 1006 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 58 × 88 = 5100 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 99 × 85 = 8415 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 72 × 71 = 5116 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 90 × 62 = 5580 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 404 + 839 = 1243 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 703 + 420 = 1125 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 87 × 51 = 4437 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 40 × 94 = 3766 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 60 × 17 = 1026 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 194 + 386 = 580 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 414 + 906 = 1320 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 808 + 580 = 1386 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 16 × 21 = 336 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 112 + 991 = 1103 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 28 × 35 = 980 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 96 × 23 = 2207 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 32 × 13 = 407 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 12 × 27 = 324 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 26 × 76 = 1985 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 36 × 37 = 1332 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 36 × 53 = 1908 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 903 + 867 = 1770 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 85 × 96 = 8160 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 88 × 14 = 1238 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 705 + 177 = 878 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 235 + 130 = 365 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 21 × 52 = 1092 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 12 × 48 = 576 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 25 × 13 = 325 right or wrong? (a) Wrong (b) Right

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