Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 608 · 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 58 × 80 = 4640 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 98 × 96 = 9408 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 64 × 36 = 2304 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 248 + 509 = 757 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 51 × 18 = 918 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 410 + 774 = 1190 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 19 × 47 = 893 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 615 + 550 = 1167 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 464 + 895 = 1360 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 92 × 49 = 4508 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 36 × 72 = 2601 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 60 × 85 = 5105 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 75 × 62 = 4650 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 57 × 14 = 791 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 40 × 26 = 1040 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 897 + 419 = 1316 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 68 × 69 = 4692 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 879 + 688 = 1567 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 410 + 996 = 1406 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 72 × 38 = 2736 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 251 + 290 = 541 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 256 + 379 = 635 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 93 × 43 = 3999 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 59 × 22 = 1294 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 44 × 48 = 2112 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 30 × 44 = 1327 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 855 + 216 = 1065 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 66 × 41 = 2706 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 145 + 775 = 926 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 976 + 979 = 1954 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 548 + 960 = 1503 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 99 × 17 = 1679 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 30 × 60 = 1800 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 63 × 45 = 2844 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 55 × 27 = 1485 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 61 × 69 = 4209 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 90 × 99 = 8910 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 59 × 16 = 944 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 71 × 18 = 1278 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 66 × 78 = 5148 right or wrong? (a) Wrong (b) Right

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