Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 287 · 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 191 + 770 = 961 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 392 + 765 = 1157 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 65 × 88 = 5720 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 22 × 24 = 520 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 39 × 31 = 1209 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 470 + 870 = 1331 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 48 × 58 = 2784 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 407 + 524 = 931 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 347 + 975 = 1322 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 420 + 511 = 931 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 93 × 34 = 3162 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 87 × 73 = 6360 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 93 × 87 = 8094 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 424 + 943 = 1367 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 951 + 636 = 1587 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 21 × 50 = 1057 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 162 + 671 = 833 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 770 + 197 = 965 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 91 × 78 = 7098 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 341 + 211 = 554 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 254 + 306 = 562 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 73 × 77 = 5626 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 41 × 65 = 2665 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 743 + 703 = 1445 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 943 + 339 = 1282 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 347 + 160 = 501 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 98 × 96 = 9412 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 59 × 17 = 1003 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 359 + 873 = 1232 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 83 × 18 = 1494 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 269 + 845 = 1114 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 458 + 735 = 1187 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 895 + 943 = 1843 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 64 × 49 = 3136 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 70 × 67 = 4690 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 382 + 897 = 1273 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 99 × 53 = 5247 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 684 + 685 = 1370 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 66 × 84 = 5544 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 662 + 201 = 863 right or wrong? (a) Wrong (b) Right

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