Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 453 · 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 206 + 985 = 1193 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 80 × 68 = 5440 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 297 + 820 = 1117 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 17 × 79 = 1343 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 23 × 19 = 437 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 159 + 207 = 362 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 924 + 773 = 1696 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 298 + 648 = 954 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 39 × 47 = 1833 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 489 + 277 = 757 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 29 × 19 = 549 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 848 + 790 = 1644 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 918 + 477 = 1387 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 49 × 78 = 3822 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 34 × 60 = 2040 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 46 × 46 = 2116 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 999 + 427 = 1426 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 31 × 68 = 2108 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 577 + 374 = 944 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 58 × 56 = 3241 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 50 × 37 = 1850 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 265 + 407 = 664 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 22 × 20 = 433 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 59 × 73 = 4312 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 641 + 826 = 1465 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 32 × 77 = 2464 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 519 + 284 = 806 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 73 × 28 = 2048 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 27 × 29 = 783 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 360 + 120 = 480 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 28 × 66 = 1845 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 87 × 98 = 8526 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 12 × 33 = 396 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 803 + 570 = 1373 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 36 × 32 = 1159 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 984 + 855 = 1835 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 91 × 23 = 2093 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 88 × 28 = 2471 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 88 × 73 = 6424 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 975 + 248 = 1223 right or wrong? (a) Right (b) Wrong

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