Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 769 · 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 875 + 822 = 1706 right or wrong? (a) Right (b) Wrong
2. 2.Last-digit check: is 25 × 41 = 1025 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 36 × 63 = 2268 right or wrong? (a) Right (b) Wrong
4. 4.Last-digit check: is 499 + 578 = 1080 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 78 × 90 = 7020 right or wrong? (a) Wrong (b) Right
6. 6.Last-digit check: is 665 + 516 = 1181 right or wrong? (a) Right (b) Wrong
7. 7.Last-digit check: is 72 × 77 = 5540 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 84 × 48 = 4032 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 79 × 75 = 5916 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 47 × 70 = 3292 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 44 × 19 = 836 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 43 × 32 = 1377 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 35 × 35 = 1231 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 86 × 33 = 2838 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 96 × 39 = 3737 right or wrong? (a) Right (b) Wrong
16. 16.Last-digit check: is 88 × 13 = 1144 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 474 + 918 = 1390 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 220 + 185 = 405 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 236 + 124 = 360 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 83 × 19 = 1577 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 72 × 39 = 2808 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 91 × 86 = 7826 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 32 × 75 = 2394 right or wrong? (a) Wrong (b) Right
24. 24.Last-digit check: is 106 + 703 = 809 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 679 + 606 = 1285 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 97 × 48 = 4656 right or wrong? (a) Wrong (b) Right
27. 27.Last-digit check: is 75 × 33 = 2475 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 14 × 51 = 710 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 21 × 15 = 315 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 622 + 590 = 1212 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 365 + 262 = 634 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 421 + 115 = 536 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 553 + 264 = 817 right or wrong? (a) Wrong (b) Right
34. 34.Last-digit check: is 77 × 41 = 3157 right or wrong? (a) Right (b) Wrong
35. 35.Last-digit check: is 158 + 983 = 1141 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 97 × 75 = 7275 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 879 + 389 = 1260 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 99 × 54 = 5348 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 277 + 913 = 1190 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 350 + 793 = 1138 right or wrong? (a) Wrong (b) Right

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