Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 58 · 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 34 × 21 = 708 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 97 × 45 = 4365 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 901 + 221 = 1122 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 32 × 76 = 2432 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 995 + 693 = 1692 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 136 + 225 = 361 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 244 + 378 = 622 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 50 × 21 = 1059 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 73 × 26 = 1898 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 30 × 73 = 2199 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 555 + 559 = 1114 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 339 + 526 = 860 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 166 + 977 = 1143 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 213 + 796 = 1001 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 58 × 49 = 2842 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 65 × 59 = 3837 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 35 × 59 = 2065 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 57 × 67 = 3819 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 137 + 507 = 644 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 471 + 739 = 1210 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 49 × 56 = 2744 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 478 + 571 = 1049 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 66 × 38 = 2506 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 56 × 54 = 3031 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 284 + 898 = 1182 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 68 × 92 = 6248 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 365 + 502 = 867 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 94 × 69 = 6486 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 196 + 985 = 1175 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 254 + 890 = 1136 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 447 + 411 = 865 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 71 × 85 = 6035 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 12 × 44 = 528 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 23 × 74 = 1710 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 75 × 16 = 1208 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 640 + 281 = 921 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 63 × 73 = 4594 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 12 × 22 = 264 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 967 + 952 = 1912 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 62 × 85 = 5274 right or wrong? (a) Wrong (b) Right

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