Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 583 · 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 88 × 83 = 7304 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 369 + 198 = 567 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 79 × 28 = 2204 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 688 + 596 = 1284 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 655 + 639 = 1294 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 16 × 70 = 1120 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 954 + 256 = 1203 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 57 × 33 = 1881 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 401 + 566 = 959 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 935 + 642 = 1583 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 80 × 60 = 4800 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 26 × 58 = 1514 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 21 × 73 = 1533 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 75 × 87 = 6525 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 474 + 637 = 1111 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 99 × 62 = 6145 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 28 × 86 = 2407 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 750 + 528 = 1276 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 155 + 725 = 880 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 48 × 95 = 4558 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 77 × 58 = 4461 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 57 × 37 = 2109 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 92 × 30 = 2754 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 74 × 50 = 3700 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 37 × 35 = 1301 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 454 + 688 = 1150 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 21 × 25 = 531 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 48 × 28 = 1342 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 61 × 78 = 4758 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 326 + 735 = 1061 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 154 + 760 = 916 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 54 × 65 = 3510 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 43 × 35 = 1503 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 783 + 385 = 1168 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 916 + 688 = 1604 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 99 × 19 = 1881 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 360 + 848 = 1208 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 623 + 305 = 937 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 32 × 45 = 1432 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 28 × 89 = 2501 right or wrong? (a) Wrong (b) Right

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