Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 913 · 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 14 × 41 = 570 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 887 + 800 = 1688 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 49 × 62 = 3040 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 140 + 471 = 611 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 355 + 996 = 1356 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 701 + 632 = 1333 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 166 + 791 = 957 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 73 × 23 = 1679 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 12 × 56 = 677 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 48 × 72 = 3456 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 114 + 673 = 787 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 851 + 626 = 1483 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 515 + 336 = 851 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 93 × 25 = 2331 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 91 × 41 = 3728 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 106 + 200 = 306 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 767 + 446 = 1211 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 907 + 207 = 1114 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 19 × 21 = 399 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 799 + 490 = 1289 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 50 × 18 = 906 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 243 + 371 = 614 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 719 + 776 = 1495 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 64 × 78 = 4986 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 654 + 228 = 885 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 713 + 497 = 1218 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 42 × 26 = 1092 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 38 × 29 = 1102 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 619 + 378 = 992 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 360 + 265 = 625 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 872 + 971 = 1843 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 515 + 371 = 883 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 443 + 576 = 1019 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 755 + 575 = 1330 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 53 × 16 = 840 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 66 × 74 = 4884 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 53 × 57 = 3025 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 826 + 455 = 1281 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 71 × 15 = 1068 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 46 × 17 = 782 right or wrong? (a) Right (b) Wrong

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