Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 15 · 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 19 × 95 = 1796 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 84 × 76 = 6384 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 345 + 802 = 1138 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 264 + 825 = 1089 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 413 + 233 = 646 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 78 × 48 = 3744 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 365 + 704 = 1076 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 83 × 18 = 1485 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 83 × 52 = 4316 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 74 × 51 = 3774 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 79 × 31 = 2458 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 228 + 610 = 846 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 26 × 79 = 2054 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 715 + 631 = 1346 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 325 + 570 = 896 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 94 × 38 = 3572 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 59 × 34 = 2006 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 65 × 31 = 2010 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 29 × 62 = 1798 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 68 × 93 = 6324 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 37 × 44 = 1623 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 67 × 46 = 3081 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 30 × 46 = 1380 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 564 + 934 = 1491 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 595 + 700 = 1295 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 69 × 98 = 6762 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 773 + 680 = 1453 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 461 + 340 = 801 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 317 + 834 = 1151 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 79 × 98 = 7742 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 88 × 48 = 4224 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 514 + 589 = 1106 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 840 + 554 = 1394 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 341 + 871 = 1212 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 53 × 39 = 2067 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 520 + 426 = 946 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 33 × 65 = 2145 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 84 × 64 = 5376 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 644 + 943 = 1588 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 39 × 29 = 1131 right or wrong? (a) Wrong (b) Right

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