Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 711 · 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 477 + 927 = 1404 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 27 × 61 = 1647 right or wrong? (a) Right (b) Wrong
3. 3.Last-digit check: is 158 + 651 = 809 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 369 + 677 = 1047 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 258 + 147 = 399 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 77 × 44 = 3388 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 97 × 99 = 9603 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 954 + 246 = 1194 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 22 × 98 = 2154 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 134 + 224 = 359 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 22 × 96 = 2107 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 141 + 435 = 576 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 14 × 21 = 291 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 395 + 980 = 1369 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 27 × 24 = 650 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 270 + 628 = 897 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 35 × 49 = 1712 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 49 × 54 = 2646 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 719 + 506 = 1217 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 578 + 520 = 1098 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 750 + 985 = 1735 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 376 + 829 = 1206 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 330 + 970 = 1300 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 619 + 579 = 1198 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 72 × 86 = 6192 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 157 + 761 = 918 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 73 × 69 = 5029 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 488 + 555 = 1043 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 701 + 900 = 1596 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 82 × 34 = 2788 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 456 + 182 = 634 right or wrong? (a) Right (b) Wrong
32. 32.Last-digit check: is 28 × 21 = 597 right or wrong? (a) Wrong (b) Right
33. 33.Last-digit check: is 705 + 198 = 903 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 65 × 39 = 2535 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 93 × 68 = 6327 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 585 + 838 = 1428 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 372 + 451 = 814 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 38 × 25 = 950 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 32 × 40 = 1280 right or wrong? (a) Right (b) Wrong
40. 40.Last-digit check: is 25 × 63 = 1580 right or wrong? (a) Wrong (b) Right

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