Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 237 · 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 61 × 38 = 2312 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 15 × 48 = 720 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 821 + 652 = 1466 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 886 + 982 = 1866 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 137 + 596 = 729 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 570 + 747 = 1315 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 32 × 78 = 2496 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 99 × 35 = 3456 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 771 + 968 = 1739 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 47 × 59 = 2764 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 26 × 76 = 1976 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 828 + 193 = 1021 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 63 × 59 = 3718 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 38 × 36 = 1363 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 46 × 28 = 1279 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 21 × 69 = 1453 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 87 × 26 = 2262 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 482 + 741 = 1223 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 64 × 28 = 1792 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 20 × 70 = 1400 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 52 × 44 = 2297 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 783 + 418 = 1194 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 63 × 79 = 4985 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 297 + 443 = 739 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 276 + 117 = 393 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 67 × 36 = 2412 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 43 × 37 = 1591 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 24 × 45 = 1081 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 382 + 120 = 504 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 810 + 547 = 1354 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 306 + 821 = 1122 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 473 + 346 = 812 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 330 + 310 = 640 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 804 + 271 = 1078 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 741 + 734 = 1484 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 162 + 204 = 359 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 149 + 122 = 271 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 55 × 27 = 1485 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 970 + 521 = 1496 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 626 + 695 = 1325 right or wrong? (a) Right (b) Wrong

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