Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 593 · 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 496 + 358 = 855 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 810 + 501 = 1310 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 592 + 469 = 1061 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 738 + 933 = 1670 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 125 + 873 = 998 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 190 + 688 = 878 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 517 + 991 = 1508 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 203 + 691 = 894 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 770 + 213 = 981 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 394 + 245 = 645 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 29 × 94 = 2726 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 54 × 95 = 5128 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 92 × 18 = 1656 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 17 × 48 = 810 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 621 + 321 = 943 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 489 + 321 = 808 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 35 × 94 = 3290 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 222 + 747 = 969 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 281 + 684 = 965 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 550 + 221 = 763 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 777 + 670 = 1445 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 927 + 383 = 1305 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 311 + 368 = 679 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 440 + 258 = 698 right or wrong? (a) Right (b) Wrong
25. 25.Last-digit check: is 491 + 230 = 721 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 425 + 755 = 1180 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 93 × 43 = 3999 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 728 + 673 = 1401 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 40 × 90 = 3600 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 84 × 18 = 1512 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 674 + 227 = 896 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 373 + 545 = 918 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 762 + 242 = 1004 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 27 × 33 = 891 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 177 + 339 = 523 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 53 × 77 = 4081 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 45 × 90 = 4050 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 32 × 61 = 1949 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 882 + 127 = 1001 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 625 + 627 = 1257 right or wrong? (a) Right (b) Wrong

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