Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 165 · 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 70 × 62 = 4340 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 61 × 50 = 3051 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 818 + 967 = 1785 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 806 + 766 = 1563 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 360 + 858 = 1218 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 675 + 337 = 1007 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 12 × 33 = 396 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 13 × 17 = 218 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 607 + 674 = 1277 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 53 × 51 = 2700 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 447 + 399 = 846 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 127 + 228 = 355 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 47 × 59 = 2774 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 616 + 147 = 763 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 112 + 443 = 555 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 46 × 41 = 1886 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 335 + 934 = 1269 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 258 + 288 = 546 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 531 + 449 = 980 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 493 + 146 = 634 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 82 × 86 = 7052 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 490 + 160 = 655 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 701 + 170 = 871 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 409 + 130 = 539 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 754 + 947 = 1701 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 16 × 94 = 1504 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 851 + 822 = 1680 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 77 × 98 = 7537 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 166 + 829 = 995 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 505 + 217 = 722 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 74 × 13 = 962 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 72 × 63 = 4536 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 316 + 239 = 550 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 809 + 158 = 965 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 43 × 68 = 2924 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 226 + 833 = 1059 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 33 × 35 = 1155 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 93 × 16 = 1488 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 86 × 17 = 1466 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 485 + 524 = 1005 right or wrong? (a) Right (b) Wrong

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