Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 70 · 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 52 × 54 = 2816 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 47 × 74 = 3477 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 637 + 489 = 1122 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 37 × 97 = 3589 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 427 + 841 = 1268 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 31 × 98 = 3038 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 69 × 99 = 6838 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 710 + 834 = 1544 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 64 × 19 = 1213 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 828 + 636 = 1464 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 380 + 804 = 1184 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 75 × 41 = 3075 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 78 × 30 = 2340 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 606 + 183 = 796 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 115 + 660 = 779 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 57 × 94 = 5359 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 80 × 39 = 3120 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 979 + 456 = 1435 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 981 + 824 = 1801 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 803 + 443 = 1243 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 64 × 87 = 5568 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 160 + 955 = 1115 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 254 + 613 = 865 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 232 + 165 = 395 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 55 × 35 = 1927 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 157 + 133 = 290 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 85 × 75 = 6373 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 17 × 62 = 1054 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 49 × 88 = 4312 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 42 × 25 = 1050 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 41 × 29 = 1189 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 98 × 20 = 1960 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 45 × 36 = 1611 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 91 × 93 = 8465 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 54 × 91 = 4910 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 345 + 200 = 545 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 88 × 84 = 7392 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 830 + 409 = 1233 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 709 + 973 = 1676 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 36 × 86 = 3100 right or wrong? (a) Wrong (b) Right

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