Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 619 · 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 63 × 24 = 1512 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 820 + 171 = 990 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 857 + 357 = 1221 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 359 + 732 = 1096 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 942 + 498 = 1433 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 29 × 87 = 2523 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 876 + 167 = 1043 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 465 + 595 = 1052 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 422 + 288 = 710 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 400 + 659 = 1059 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 619 + 930 = 1549 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 755 + 869 = 1624 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 34 × 14 = 474 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 973 + 867 = 1840 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 719 + 913 = 1632 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 140 + 625 = 765 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 92 × 98 = 9020 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 707 + 501 = 1208 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 65 × 40 = 2600 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 623 + 503 = 1126 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 75 × 78 = 5850 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 316 + 517 = 842 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 26 × 18 = 463 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 64 × 23 = 1481 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 56 × 45 = 2527 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 356 + 271 = 627 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 600 + 971 = 1571 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 84 × 22 = 1848 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 777 + 149 = 925 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 539 + 364 = 902 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 109 + 685 = 794 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 755 + 130 = 885 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 516 + 523 = 1047 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 66 × 67 = 4422 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 74 × 60 = 4445 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 438 + 734 = 1165 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 53 × 55 = 2921 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 16 × 62 = 995 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 78 × 17 = 1320 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 83 × 59 = 4895 right or wrong? (a) Wrong (b) Right

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