Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 122 · 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 187 + 358 = 545 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 76 × 13 = 988 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 191 + 732 = 923 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 199 + 629 = 828 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 554 + 288 = 845 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 607 + 318 = 925 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 597 + 541 = 1134 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 49 × 95 = 4651 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 317 + 542 = 858 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 154 + 150 = 310 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 162 + 544 = 708 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 501 + 204 = 698 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 20 × 26 = 520 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 151 + 917 = 1069 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 257 + 200 = 457 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 997 + 172 = 1162 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 70 × 24 = 1687 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 52 × 97 = 5052 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 19 × 27 = 511 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 499 + 144 = 635 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 77 × 93 = 7156 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 80 × 98 = 7842 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 895 + 194 = 1089 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 699 + 814 = 1513 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 433 + 201 = 631 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 54 × 63 = 3402 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 53 × 24 = 1267 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 12 × 31 = 372 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 89 × 69 = 6141 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 196 + 464 = 660 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 470 + 207 = 677 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 29 × 65 = 1890 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 58 × 59 = 3422 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 65 × 53 = 3445 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 80 × 13 = 1031 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 168 + 367 = 535 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 47 × 48 = 2262 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 18 × 90 = 1628 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 76 × 46 = 3496 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 43 × 23 = 996 right or wrong? (a) Wrong (b) Right

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