Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 656 · 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 418 + 364 = 782 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 644 + 595 = 1234 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 186 + 313 = 497 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 579 + 241 = 819 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 74 × 73 = 5407 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 36 × 35 = 1260 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 94 × 25 = 2356 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 920 + 114 = 1027 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 366 + 679 = 1045 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 942 + 251 = 1192 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 97 × 41 = 3977 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 799 + 350 = 1140 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 44 × 96 = 4224 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 71 × 62 = 4406 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 407 + 887 = 1302 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 420 + 737 = 1162 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 28 × 34 = 952 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 43 × 45 = 1935 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 16 × 51 = 816 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 89 × 18 = 1603 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 39 × 76 = 2964 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 500 + 702 = 1202 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 72 × 78 = 5616 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 75 × 53 = 3972 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 17 × 50 = 855 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 95 × 32 = 3031 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 19 × 18 = 342 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 58 × 85 = 4921 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 88 × 18 = 1589 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 464 + 935 = 1405 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 620 + 787 = 1404 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 536 + 370 = 906 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 254 + 275 = 521 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 49 × 79 = 3869 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 275 + 710 = 985 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 398 + 370 = 768 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 20 × 89 = 1780 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 51 × 44 = 2242 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 62 × 48 = 2976 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 941 + 298 = 1239 right or wrong? (a) Right (b) Wrong

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