Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 271 · 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 865 + 869 = 1736 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 307 + 895 = 1202 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 72 × 37 = 2664 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 36 × 56 = 2016 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 941 + 699 = 1640 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 711 + 648 = 1367 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 26 × 81 = 2109 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 58 × 67 = 3886 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 16 × 21 = 341 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 91 × 56 = 5096 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 553 + 132 = 685 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 25 × 25 = 618 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 826 + 390 = 1209 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 73 × 72 = 5255 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 77 × 38 = 2926 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 77 × 71 = 5461 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 62 × 87 = 5403 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 590 + 671 = 1261 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 913 + 446 = 1359 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 138 + 209 = 347 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 655 + 348 = 1002 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 70 × 85 = 5950 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 716 + 546 = 1262 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 25 × 73 = 1825 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 182 + 585 = 772 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 280 + 662 = 935 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 14 × 78 = 1083 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 31 × 83 = 2570 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 682 + 892 = 1580 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 508 + 165 = 680 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 206 + 486 = 692 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 119 + 378 = 506 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 44 × 34 = 1496 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 106 + 324 = 430 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 26 × 13 = 333 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 510 + 300 = 811 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 99 × 27 = 2667 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 173 + 365 = 540 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 743 + 289 = 1039 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 25 × 42 = 1041 right or wrong? (a) Wrong (b) Right

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