Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 856 · 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 158 + 557 = 715 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 92 × 41 = 3772 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 67 × 59 = 3953 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 49 × 29 = 1420 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 833 + 215 = 1049 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 924 + 121 = 1046 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 40 × 75 = 3008 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 75 × 87 = 6516 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 152 + 340 = 492 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 17 × 19 = 330 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 21 × 58 = 1218 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 124 + 387 = 511 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 32 × 85 = 2718 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 86 × 30 = 2580 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 26 × 56 = 1465 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 61 × 26 = 1589 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 36 × 77 = 2770 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 657 + 660 = 1317 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 80 × 22 = 1760 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 772 + 431 = 1203 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 604 + 611 = 1207 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 761 + 695 = 1456 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 58 × 52 = 3016 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 38 × 25 = 950 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 673 + 630 = 1303 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 130 + 473 = 603 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 575 + 308 = 883 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 60 × 74 = 4440 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 87 × 72 = 6258 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 806 + 569 = 1375 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 43 × 78 = 3363 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 28 × 94 = 2625 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 422 + 512 = 934 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 29 × 33 = 957 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 366 + 492 = 858 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 807 + 171 = 977 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 57 × 29 = 1653 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 42 × 90 = 3781 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 93 × 94 = 8735 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 52 × 15 = 780 right or wrong? (a) Wrong (b) Right

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