Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 458 · 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 660 + 925 = 1579 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 76 × 62 = 4707 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 853 + 650 = 1503 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 14 × 29 = 400 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 115 + 265 = 383 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 708 + 221 = 929 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 31 × 95 = 2946 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 16 × 36 = 580 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 90 × 77 = 6929 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 493 + 668 = 1159 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 187 + 146 = 333 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 226 + 252 = 482 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 734 + 135 = 865 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 93 × 96 = 8922 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 63 × 87 = 5481 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 66 × 41 = 2706 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 43 × 83 = 3573 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 499 + 896 = 1395 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 18 × 23 = 414 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 663 + 936 = 1599 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 332 + 385 = 717 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 205 + 777 = 982 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 45 × 54 = 2430 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 503 + 227 = 734 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 87 × 42 = 3654 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 892 + 936 = 1828 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 98 × 58 = 5692 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 43 × 95 = 4094 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 714 + 660 = 1380 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 98 × 27 = 2650 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 69 × 64 = 4416 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 806 + 221 = 1027 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 567 + 915 = 1482 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 387 + 947 = 1331 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 992 + 508 = 1502 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 149 + 874 = 1023 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 65 × 58 = 3770 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 69 × 51 = 3519 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 380 + 348 = 728 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 38 × 68 = 2581 right or wrong? (a) Wrong (b) Right

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