Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 839 · 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 662 + 976 = 1631 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 956 + 754 = 1704 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 79 × 23 = 1816 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 874 + 301 = 1171 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 98 × 69 = 6762 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 395 + 854 = 1249 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 656 + 676 = 1332 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 99 × 17 = 1680 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 423 + 383 = 806 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 43 × 15 = 645 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 14 × 64 = 889 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 406 + 160 = 566 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 50 × 18 = 908 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 678 + 115 = 793 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 23 × 98 = 2254 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 17 × 18 = 306 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 79 × 15 = 1182 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 762 + 776 = 1543 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 605 + 940 = 1554 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 97 × 60 = 5820 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 528 + 615 = 1143 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 72 × 29 = 2088 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 60 × 36 = 2161 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 43 × 71 = 3053 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 47 × 66 = 3102 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 685 + 376 = 1061 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 84 × 26 = 2184 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 589 + 821 = 1410 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 208 + 783 = 991 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 888 + 466 = 1354 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 31 × 55 = 1705 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 539 + 370 = 905 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 16 × 99 = 1584 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 962 + 983 = 1945 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 16 × 83 = 1328 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 51 × 52 = 2652 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 690 + 968 = 1658 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 16 × 26 = 416 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 959 + 645 = 1606 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 67 × 43 = 2881 right or wrong? (a) Right (b) Wrong

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