Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 145 · 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 581 + 837 = 1418 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 625 + 650 = 1275 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 41 × 73 = 2988 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 95 × 37 = 3512 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 664 + 495 = 1159 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 77 × 31 = 2385 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 92 × 18 = 1651 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 820 + 209 = 1029 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 885 + 311 = 1190 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 437 + 925 = 1367 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 23 × 64 = 1479 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 969 + 531 = 1493 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 93 × 64 = 5945 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 76 × 87 = 6612 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 92 × 35 = 3220 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 63 × 18 = 1134 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 862 + 896 = 1766 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 422 + 824 = 1241 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 354 + 486 = 849 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 18 × 36 = 641 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 902 + 205 = 1107 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 51 × 82 = 4182 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 28 × 97 = 2710 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 196 + 257 = 453 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 23 × 86 = 1987 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 841 + 964 = 1805 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 91 × 44 = 4004 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 98 × 58 = 5675 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 217 + 827 = 1044 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 32 × 13 = 416 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 31 × 25 = 771 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 172 + 969 = 1141 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 91 × 68 = 6188 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 16 × 77 = 1232 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 723 + 176 = 899 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 975 + 244 = 1219 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 36 × 63 = 2273 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 23 × 37 = 846 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 63 × 53 = 3339 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 94 × 23 = 2162 right or wrong? (a) Right (b) Wrong

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