Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 696 · 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 354 + 379 = 736 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 306 + 804 = 1110 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 75 × 43 = 3225 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 57 × 77 = 4396 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 23 × 18 = 418 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 42 × 55 = 2310 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 401 + 192 = 593 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 44 × 19 = 836 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 25 × 23 = 575 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 73 × 43 = 3147 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 23 × 20 = 460 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 45 × 14 = 630 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 339 + 375 = 715 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 41 × 23 = 943 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 62 × 53 = 3283 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 851 + 291 = 1145 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 95 × 70 = 6653 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 139 + 150 = 289 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 51 × 55 = 2800 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 51 × 13 = 654 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 229 + 391 = 620 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 54 × 43 = 2322 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 73 × 59 = 4306 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 353 + 693 = 1055 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 13 × 41 = 533 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 71 × 30 = 2130 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 617 + 701 = 1318 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 50 × 72 = 3607 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 196 + 421 = 617 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 67 × 22 = 1474 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 96 × 17 = 1632 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 737 + 464 = 1194 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 920 + 458 = 1378 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 692 + 107 = 793 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 244 + 591 = 835 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 87 × 34 = 2967 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 262 + 467 = 724 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 13 × 14 = 182 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 827 + 404 = 1231 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 991 + 337 = 1328 right or wrong? (a) Right (b) Wrong

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