Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 939 · 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 84 × 60 = 5040 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 800 + 704 = 1510 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 65 × 18 = 1164 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 250 + 968 = 1218 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 61 × 59 = 3596 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 153 + 660 = 813 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 588 + 579 = 1163 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 13 × 42 = 546 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 692 + 809 = 1509 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 57 × 34 = 1935 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 871 + 527 = 1399 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 391 + 737 = 1120 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 91 × 22 = 2002 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 29 × 66 = 1905 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 823 + 586 = 1409 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 124 + 860 = 975 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 357 + 843 = 1202 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 309 + 516 = 825 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 70 × 14 = 986 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 773 + 159 = 929 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 532 + 430 = 962 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 756 + 755 = 1511 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 750 + 329 = 1079 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 36 × 32 = 1152 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 14 × 48 = 664 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 22 × 69 = 1518 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 764 + 228 = 983 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 38 × 87 = 3306 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 23 × 30 = 690 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 47 × 93 = 4371 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 890 + 666 = 1552 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 47 × 87 = 4089 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 15 × 55 = 825 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 344 + 363 = 708 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 42 × 38 = 1596 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 50 × 24 = 1203 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 33 × 99 = 3269 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 65 × 24 = 1558 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 25 × 93 = 2322 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 78 × 27 = 2108 right or wrong? (a) Right (b) Wrong

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