Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 790 · 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 757 + 962 = 1719 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 890 + 991 = 1881 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 54 × 42 = 2268 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 70 × 28 = 1953 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 623 + 168 = 790 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 63 × 51 = 3213 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 227 + 548 = 780 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 25 × 38 = 941 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 18 × 38 = 684 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 14 × 99 = 1386 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 46 × 59 = 2714 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 65 × 66 = 4292 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 876 + 476 = 1354 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 48 × 28 = 1344 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 43 × 51 = 2193 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 17 × 24 = 417 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 125 + 910 = 1035 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 24 × 57 = 1366 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 76 × 53 = 4025 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 35 × 70 = 2459 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 683 + 502 = 1193 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 68 × 38 = 2589 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 933 + 155 = 1082 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 807 + 429 = 1245 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 48 × 57 = 2740 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 21 × 36 = 756 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 437 + 749 = 1186 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 52 × 28 = 1447 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 96 × 80 = 7680 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 106 + 283 = 389 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 71 × 96 = 6809 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 59 × 15 = 885 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 233 + 210 = 438 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 937 + 504 = 1446 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 245 + 795 = 1040 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 12 × 60 = 723 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 552 + 780 = 1332 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 92 × 24 = 2208 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 79 × 27 = 2140 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 77 × 87 = 6699 right or wrong? (a) Right (b) Wrong

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