Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 552 · 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 66 × 19 = 1254 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 541 + 869 = 1404 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 83 × 20 = 1660 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 63 × 86 = 5418 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 916 + 195 = 1119 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 428 + 190 = 618 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 760 + 553 = 1313 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 270 + 342 = 620 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 88 × 35 = 3086 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 63 × 22 = 1386 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 808 + 732 = 1540 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 35 × 16 = 569 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 680 + 859 = 1538 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 660 + 710 = 1379 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 51 × 68 = 3465 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 30 × 53 = 1590 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 616 + 120 = 733 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 47 × 55 = 2585 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 82 × 23 = 1889 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 612 + 563 = 1175 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 81 × 30 = 2430 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 244 + 637 = 887 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 93 × 74 = 6882 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 896 + 650 = 1546 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 465 + 493 = 958 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 470 + 563 = 1034 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 13 × 34 = 442 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 97 × 72 = 6987 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 57 × 98 = 5593 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 53 × 21 = 1113 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 502 + 207 = 708 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 817 + 831 = 1651 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 65 × 80 = 5200 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 67 × 62 = 4154 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 60 × 31 = 1860 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 89 × 50 = 4450 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 953 + 281 = 1234 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 96 × 76 = 7298 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 760 + 355 = 1109 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 940 + 910 = 1853 right or wrong? (a) Wrong (b) Right

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