Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 716 · 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 37 × 82 = 3040 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 67 × 45 = 3022 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 173 + 194 = 367 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 183 + 557 = 734 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 70 × 22 = 1547 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 534 + 895 = 1421 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 75 × 53 = 3975 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 266 + 457 = 722 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 452 + 247 = 699 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 544 + 801 = 1345 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 691 + 328 = 1024 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 588 + 212 = 800 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 65 × 82 = 5330 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 395 + 984 = 1385 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 67 × 46 = 3089 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 516 + 142 = 659 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 58 × 42 = 2436 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 74 × 41 = 3034 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 13 × 50 = 649 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 411 + 409 = 820 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 449 + 663 = 1103 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 47 × 27 = 1269 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 55 × 50 = 2746 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 535 + 335 = 879 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 93 × 24 = 2233 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 82 × 90 = 7389 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 99 × 83 = 8217 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 303 + 490 = 793 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 191 + 339 = 530 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 785 + 256 = 1033 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 35 × 64 = 2240 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 21 × 85 = 1791 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 552 + 750 = 1302 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 18 × 94 = 1692 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 64 × 83 = 5312 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 30 × 64 = 1912 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 19 × 12 = 228 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 84 × 54 = 4545 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 494 + 389 = 892 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 25 × 52 = 1299 right or wrong? (a) Wrong (b) Right

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