Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 435 · 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 63 × 42 = 2646 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 207 + 387 = 586 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 98 × 40 = 3919 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 52 × 68 = 3541 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 79 × 83 = 6553 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 82 × 86 = 7057 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 875 + 531 = 1399 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 585 + 283 = 868 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 906 + 972 = 1874 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 437 + 285 = 718 right or wrong? (a) Wrong (b) Right
11. 11.Last-digit check: is 74 × 33 = 2444 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 213 + 367 = 577 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 305 + 193 = 498 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 373 + 473 = 846 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 251 + 681 = 932 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 16 × 58 = 933 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 72 × 74 = 5331 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 923 + 376 = 1299 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 734 + 629 = 1363 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 33 × 43 = 1419 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 93 × 60 = 5579 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 47 × 92 = 4324 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 35 × 20 = 707 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 997 + 387 = 1384 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 64 × 24 = 1536 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 238 + 192 = 433 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 727 + 475 = 1202 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 407 + 962 = 1369 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 781 + 669 = 1450 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 139 + 828 = 967 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 690 + 452 = 1142 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 712 + 538 = 1250 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 735 + 779 = 1514 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 903 + 534 = 1441 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 863 + 586 = 1450 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 27 × 71 = 1924 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 437 + 345 = 791 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 30 × 95 = 2850 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 51 × 38 = 1938 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 850 + 965 = 1815 right or wrong? (a) Wrong (b) Right

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