Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 379 · 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 880 + 342 = 1222 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 890 + 378 = 1264 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 35 × 46 = 1610 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 82 × 68 = 5576 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 65 × 98 = 6370 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 552 + 661 = 1213 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 310 + 518 = 823 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 615 + 784 = 1399 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 75 × 97 = 7275 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 749 + 712 = 1461 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 41 × 28 = 1148 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 33 × 17 = 552 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 68 × 14 = 943 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 25 × 33 = 821 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 47 × 49 = 2303 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 930 + 309 = 1248 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 578 + 708 = 1290 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 400 + 135 = 534 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 950 + 913 = 1863 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 181 + 587 = 767 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 645 + 182 = 834 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 182 + 594 = 776 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 733 + 917 = 1650 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 79 × 66 = 5214 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 60 × 30 = 1793 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 212 + 646 = 858 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 482 + 707 = 1189 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 20 × 83 = 1666 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 255 + 686 = 946 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 87 × 56 = 4872 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 79 × 24 = 1895 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 66 × 57 = 3765 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 44 × 92 = 4055 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 22 × 42 = 924 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 23 × 65 = 1490 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 75 × 56 = 4200 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 903 + 579 = 1482 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 71 × 21 = 1491 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 14 × 73 = 1018 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 989 + 524 = 1513 right or wrong? (a) Wrong (b) Right

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