Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 949 · 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 733 + 755 = 1488 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 66 × 97 = 6405 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 200 + 520 = 729 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 70 × 62 = 4340 right or wrong? (a) Right (b) Wrong
5. 5.Last-digit check: is 62 × 88 = 5456 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 76 × 16 = 1216 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 320 + 606 = 934 right or wrong? (a) Right (b) Wrong
8. 8.Last-digit check: is 481 + 137 = 614 right or wrong? (a) Right (b) Wrong
9. 9.Last-digit check: is 21 × 13 = 280 right or wrong? (a) Right (b) Wrong
10. 10.Last-digit check: is 56 × 23 = 1288 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 39 × 97 = 3779 right or wrong? (a) Wrong (b) Right
12. 12.Last-digit check: is 86 × 46 = 3956 right or wrong? (a) Right (b) Wrong
13. 13.Last-digit check: is 87 × 58 = 5046 right or wrong? (a) Wrong (b) Right
14. 14.Last-digit check: is 118 + 160 = 278 right or wrong? (a) Wrong (b) Right
15. 15.Last-digit check: is 711 + 941 = 1652 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 325 + 172 = 502 right or wrong? (a) Right (b) Wrong
17. 17.Last-digit check: is 240 + 794 = 1043 right or wrong? (a) Wrong (b) Right
18. 18.Last-digit check: is 277 + 220 = 497 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 686 + 500 = 1186 right or wrong? (a) Wrong (b) Right
20. 20.Last-digit check: is 24 × 37 = 888 right or wrong? (a) Right (b) Wrong
21. 21.Last-digit check: is 971 + 979 = 1950 right or wrong? (a) Right (b) Wrong
22. 22.Last-digit check: is 47 × 52 = 2444 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 589 + 722 = 1316 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 485 + 702 = 1187 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 22 × 24 = 528 right or wrong? (a) Right (b) Wrong
26. 26.Last-digit check: is 89 × 70 = 6230 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 31 × 17 = 527 right or wrong? (a) Right (b) Wrong
28. 28.Last-digit check: is 540 + 565 = 1100 right or wrong? (a) Wrong (b) Right
29. 29.Last-digit check: is 300 + 214 = 514 right or wrong? (a) Wrong (b) Right
30. 30.Last-digit check: is 37 × 56 = 2072 right or wrong? (a) Wrong (b) Right
31. 31.Last-digit check: is 26 × 67 = 1734 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 52 × 71 = 3692 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 55 × 57 = 3132 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 19 × 97 = 1843 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 33 × 70 = 2310 right or wrong? (a) Right (b) Wrong
36. 36.Last-digit check: is 50 × 20 = 1000 right or wrong? (a) Wrong (b) Right
37. 37.Last-digit check: is 708 + 503 = 1212 right or wrong? (a) Right (b) Wrong
38. 38.Last-digit check: is 681 + 238 = 917 right or wrong? (a) Wrong (b) Right
39. 39.Last-digit check: is 596 + 163 = 759 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 388 + 267 = 646 right or wrong? (a) Right (b) Wrong

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