Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 793 · 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 290 + 573 = 863 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 84 × 25 = 2100 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 279 + 371 = 650 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 454 + 726 = 1180 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 252 + 878 = 1127 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 626 + 377 = 995 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 34 × 95 = 3230 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 94 × 46 = 4326 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 12 × 69 = 828 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 13 × 79 = 1033 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 954 + 856 = 1810 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 48 × 65 = 3117 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 960 + 144 = 1104 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 445 + 216 = 661 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 25 × 18 = 452 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 71 × 13 = 923 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 732 + 903 = 1635 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 54 × 87 = 4698 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 71 × 40 = 2840 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 84 × 66 = 5542 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 992 + 530 = 1522 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 25 × 87 = 2175 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 27 × 70 = 1892 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 817 + 482 = 1299 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 21 × 79 = 1663 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 673 + 977 = 1653 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 813 + 338 = 1149 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 642 + 594 = 1238 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 108 + 911 = 1019 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 64 × 53 = 3388 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 123 + 557 = 673 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 66 × 48 = 3159 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 539 + 401 = 935 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 87 × 99 = 8613 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 924 + 355 = 1279 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 746 + 364 = 1110 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 427 + 469 = 896 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 367 + 988 = 1363 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 798 + 316 = 1111 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 46 × 60 = 2760 right or wrong? (a) Wrong (b) Right

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