Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 43 · 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 366 + 493 = 859 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 55 × 22 = 1208 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 632 + 821 = 1452 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 35 × 19 = 665 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 26 × 87 = 2264 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 668 + 851 = 1519 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 84 × 13 = 1092 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 364 + 142 = 506 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 460 + 209 = 662 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 13 × 66 = 858 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 647 + 771 = 1410 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 320 + 688 = 1008 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 818 + 497 = 1315 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 847 + 223 = 1070 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 492 + 167 = 659 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 83 × 88 = 7304 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 95 × 64 = 6080 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 162 + 175 = 330 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 931 + 969 = 1906 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 60 × 25 = 1500 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 48 × 13 = 631 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 529 + 408 = 936 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 34 × 75 = 2550 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 46 × 67 = 3082 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 831 + 325 = 1162 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 958 + 320 = 1274 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 429 + 485 = 914 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 45 × 73 = 3278 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 82 × 84 = 6893 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 94 × 76 = 7144 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 54 × 22 = 1184 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 35 × 89 = 3118 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 986 + 302 = 1290 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 586 + 931 = 1513 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 95 × 36 = 3429 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 44 × 34 = 1503 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 942 + 194 = 1130 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 18 × 99 = 1782 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 82 × 96 = 7872 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 64 × 48 = 3072 right or wrong? (a) Right (b) Wrong

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