Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 762 · 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 96 × 50 = 4795 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 84 × 34 = 2856 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 93 × 48 = 4457 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 238 + 457 = 695 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 888 + 963 = 1851 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 733 + 845 = 1578 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 374 + 945 = 1319 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 464 + 279 = 745 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 315 + 188 = 503 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 693 + 486 = 1182 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 92 × 36 = 3312 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 56 × 26 = 1456 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 350 + 337 = 683 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 856 + 685 = 1541 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 389 + 498 = 883 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 132 + 690 = 827 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 972 + 737 = 1709 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 333 + 510 = 837 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 636 + 620 = 1254 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 80 × 65 = 5200 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 503 + 962 = 1456 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 252 + 451 = 703 right or wrong? (a) Right (b) Wrong
23. 23.Last-digit check: is 709 + 336 = 1050 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 353 + 219 = 578 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 269 + 737 = 1013 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 329 + 597 = 926 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 57 × 52 = 2964 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 443 + 559 = 1002 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 165 + 240 = 405 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 233 + 984 = 1211 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 616 + 996 = 1607 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 88 × 99 = 8712 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 874 + 803 = 1682 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 49 × 13 = 630 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 37 × 67 = 2486 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 788 + 673 = 1461 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 84 × 88 = 7392 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 75 × 76 = 5700 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 37 × 30 = 1110 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 809 + 518 = 1332 right or wrong? (a) Right (b) Wrong

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