Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 628 · 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 511 + 797 = 1317 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 992 + 664 = 1650 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 632 + 329 = 961 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 692 + 295 = 986 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 14 × 91 = 1280 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 59 × 21 = 1233 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 188 + 586 = 774 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 283 + 998 = 1281 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 78 × 67 = 5229 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 991 + 588 = 1579 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 84 × 45 = 3780 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 574 + 592 = 1170 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 231 + 486 = 717 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 94 × 18 = 1692 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 194 + 210 = 395 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 748 + 614 = 1360 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 73 × 18 = 1321 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 47 × 98 = 4606 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 681 + 435 = 1123 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 57 × 15 = 855 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 607 + 137 = 744 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 69 × 74 = 5115 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 20 × 44 = 880 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 713 + 252 = 972 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 44 × 26 = 1144 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 76 × 79 = 6004 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 907 + 320 = 1227 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 627 + 367 = 989 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 286 + 897 = 1183 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 37 × 13 = 474 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 962 + 311 = 1273 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 75 × 94 = 7050 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 19 × 35 = 665 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 491 + 940 = 1422 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 36 × 32 = 1159 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 217 + 359 = 576 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 718 + 664 = 1384 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 62 × 69 = 4278 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 53 × 18 = 954 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 535 + 553 = 1088 right or wrong? (a) Wrong (b) Right

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