Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 969 · 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 35 × 46 = 1610 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 659 + 173 = 832 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 33 × 61 = 2005 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 303 + 240 = 543 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 67 × 28 = 1875 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 202 + 866 = 1068 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 67 × 68 = 4552 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 79 × 66 = 5214 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 96 × 20 = 1920 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 848 + 354 = 1202 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 25 × 13 = 324 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 32 × 14 = 457 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 691 + 746 = 1437 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 738 + 488 = 1217 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 78 × 25 = 1950 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 105 + 107 = 213 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 52 × 92 = 4784 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 723 + 434 = 1159 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 81 × 83 = 6716 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 87 × 46 = 4001 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 25 × 53 = 1316 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 94 × 58 = 5452 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 86 × 98 = 8430 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 507 + 320 = 826 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 107 + 635 = 743 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 270 + 464 = 742 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 61 × 65 = 3962 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 932 + 271 = 1200 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 547 + 360 = 898 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 524 + 842 = 1366 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 663 + 250 = 913 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 351 + 373 = 720 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 27 × 68 = 1844 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 362 + 462 = 824 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 77 × 44 = 3388 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 51 × 61 = 3117 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 37 × 76 = 2812 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 471 + 731 = 1202 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 65 × 36 = 2340 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 622 + 791 = 1413 right or wrong? (a) Wrong (b) Right

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