Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 799 · 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 374 + 770 = 1153 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 534 + 359 = 889 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 944 + 592 = 1536 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 594 + 279 = 875 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 809 + 118 = 927 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 74 × 78 = 5766 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 551 + 998 = 1544 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 43 × 29 = 1251 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 97 × 16 = 1552 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 21 × 16 = 336 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 819 + 164 = 983 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 20 × 26 = 520 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 68 × 82 = 5576 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 19 × 15 = 291 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 178 + 848 = 1024 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 34 × 68 = 2303 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 281 + 363 = 644 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 48 × 70 = 3369 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 22 × 43 = 937 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 92 × 20 = 1840 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 26 × 42 = 1092 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 73 × 20 = 1454 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 674 + 786 = 1460 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 62 × 58 = 3596 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 387 + 127 = 514 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 92 × 45 = 4140 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 258 + 289 = 547 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 90 × 56 = 5039 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 25 × 13 = 325 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 31 × 60 = 1852 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 26 × 26 = 671 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 86 × 66 = 5676 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 30 × 72 = 2160 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 51 × 62 = 3171 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 558 + 292 = 858 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 55 × 43 = 2365 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 34 × 17 = 581 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 62 × 77 = 4774 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 266 + 306 = 571 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 88 × 61 = 5366 right or wrong? (a) Wrong (b) Right

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