Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 673 · 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 67 × 16 = 1072 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 584 + 573 = 1151 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 69 × 49 = 3381 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 72 × 66 = 4745 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 58 × 26 = 1508 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 441 + 344 = 784 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 31 × 48 = 1488 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 13 × 66 = 858 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 78 × 39 = 3042 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 91 × 60 = 5464 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 37 × 16 = 598 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 96 × 47 = 4512 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 625 + 817 = 1442 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 710 + 303 = 1013 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 21 × 74 = 1554 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 54 × 14 = 756 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 148 + 803 = 951 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 92 × 46 = 4230 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 30 × 50 = 1501 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 73 × 21 = 1538 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 52 × 13 = 676 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 39 × 98 = 3822 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 39 × 66 = 2570 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 75 × 78 = 5847 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 158 + 700 = 858 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 120 + 143 = 260 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 34 × 87 = 2958 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 548 + 158 = 707 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 30 × 54 = 1620 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 969 + 713 = 1682 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 460 + 288 = 755 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 36 × 29 = 1044 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 83 × 54 = 4482 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 423 + 706 = 1132 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 15 × 65 = 975 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 44 × 60 = 2640 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 17 × 36 = 612 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 632 + 392 = 1024 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 12 × 33 = 394 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 18 × 81 = 1461 right or wrong? (a) Right (b) Wrong

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