Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 602 · 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 217 + 975 = 1195 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 589 + 418 = 1007 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 88 × 39 = 3432 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 32 × 82 = 2617 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 57 × 24 = 1365 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 81 × 25 = 2025 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 599 + 677 = 1276 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 28 × 56 = 1568 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 18 × 16 = 288 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 90 × 32 = 2880 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 40 × 37 = 1479 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 540 + 986 = 1533 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 32 × 81 = 2585 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 31 × 76 = 2356 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 28 × 39 = 1100 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 12 × 17 = 204 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 130 + 888 = 1018 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 91 × 75 = 6830 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 54 × 25 = 1356 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 75 × 80 = 6000 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 15 × 15 = 225 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 788 + 535 = 1323 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 249 + 842 = 1082 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 57 × 28 = 1605 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 176 + 796 = 972 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 12 × 52 = 624 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 25 × 79 = 1975 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 84 × 51 = 4283 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 20 × 99 = 1980 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 46 × 64 = 2947 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 81 × 78 = 6320 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 628 + 355 = 983 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 59 × 40 = 2360 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 293 + 730 = 1023 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 76 × 36 = 2742 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 711 + 430 = 1147 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 464 + 730 = 1189 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 31 × 25 = 770 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 69 × 65 = 4485 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 17 × 86 = 1462 right or wrong? (a) Right (b) Wrong

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