Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 875 · 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 590 + 981 = 1571 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 20 × 59 = 1189 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 870 + 968 = 1838 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 58 × 13 = 754 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 38 × 45 = 1704 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 35 × 22 = 770 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 680 + 208 = 881 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 86 × 43 = 3697 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 938 + 531 = 1471 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 75 × 49 = 3675 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 29 × 89 = 2581 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 49 × 81 = 3969 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 41 × 76 = 3116 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 273 + 164 = 437 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 33 × 98 = 3237 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 556 + 468 = 1022 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 129 + 746 = 875 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 882 + 663 = 1545 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 409 + 313 = 722 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 664 + 440 = 1112 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 73 × 16 = 1168 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 29 × 67 = 1944 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 51 × 81 = 4136 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 758 + 942 = 1702 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 97 × 37 = 3589 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 41 × 18 = 734 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 801 + 235 = 1031 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 69 × 65 = 4487 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 70 × 60 = 4200 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 608 + 813 = 1421 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 68 × 86 = 5845 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 94 × 37 = 3478 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 72 × 64 = 4606 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 82 × 35 = 2871 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 943 + 782 = 1725 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 31 × 90 = 2790 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 230 + 900 = 1122 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 40 × 18 = 720 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 340 + 665 = 996 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 735 + 862 = 1597 right or wrong? (a) Wrong (b) Right

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