Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 736 · 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 434 + 570 = 1004 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 31 × 44 = 1364 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 50 × 85 = 4257 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 197 + 333 = 530 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 42 × 73 = 3066 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 31 × 15 = 465 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 688 + 168 = 862 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 123 + 215 = 338 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 20 × 29 = 580 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 386 + 562 = 946 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 79 × 33 = 2616 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 428 + 380 = 808 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 558 + 309 = 875 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 879 + 406 = 1285 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 32 × 22 = 699 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 359 + 251 = 618 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 235 + 847 = 1091 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 19 × 62 = 1173 right or wrong? (a) Right (b) Wrong
19. 19.Last-digit check: is 468 + 120 = 579 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 75 × 42 = 3152 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 185 + 527 = 712 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 32 × 38 = 1219 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 19 × 37 = 696 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 724 + 821 = 1545 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 116 + 429 = 545 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 272 + 488 = 760 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 526 + 809 = 1337 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 965 + 459 = 1416 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 127 + 241 = 368 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 26 × 27 = 702 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 804 + 697 = 1501 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 333 + 324 = 653 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 747 + 175 = 921 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 305 + 901 = 1215 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 438 + 940 = 1379 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 52 × 13 = 672 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 22 × 63 = 1389 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 983 + 653 = 1636 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 22 × 80 = 1756 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 877 + 346 = 1223 right or wrong? (a) Wrong (b) Right

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