Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 170 · 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 146 + 369 = 515 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 888 + 352 = 1240 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 17 × 79 = 1336 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 78 × 29 = 2255 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 43 × 33 = 1419 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 51 × 69 = 3519 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 30 × 69 = 2070 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 783 + 928 = 1713 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 893 + 354 = 1248 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 959 + 482 = 1445 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 650 + 631 = 1281 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 39 × 34 = 1322 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 23 × 75 = 1726 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 24 × 40 = 964 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 529 + 568 = 1096 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 24 × 15 = 360 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 31 × 82 = 2550 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 57 × 91 = 5187 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 91 × 14 = 1274 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 86 × 50 = 4300 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 371 + 415 = 785 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 93 × 44 = 4092 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 16 × 56 = 905 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 321 + 761 = 1082 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 245 + 324 = 569 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 18 × 40 = 712 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 78 × 32 = 2496 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 31 × 61 = 1886 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 343 + 734 = 1077 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 92 × 35 = 3220 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 76 × 57 = 4331 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 848 + 662 = 1510 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 99 × 28 = 2772 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 549 + 533 = 1082 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 487 + 154 = 640 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 62 × 92 = 5708 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 182 + 217 = 399 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 28 × 72 = 2009 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 464 + 224 = 688 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 72 × 45 = 3241 right or wrong? (a) Wrong (b) Right

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