Check Your Answers Worksheet

Maths tricks trick 22: Last-digit detective · Set 798 · 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 247 + 132 = 371 right or wrong? (a) Wrong (b) Right
2. 2.Last-digit check: is 550 + 805 = 1355 right or wrong? (a) Wrong (b) Right
3. 3.Last-digit check: is 239 + 966 = 1205 right or wrong? (a) Wrong (b) Right
4. 4.Last-digit check: is 30 × 54 = 1616 right or wrong? (a) Wrong (b) Right
5. 5.Last-digit check: is 72 × 67 = 4819 right or wrong? (a) Right (b) Wrong
6. 6.Last-digit check: is 45 × 68 = 3059 right or wrong? (a) Wrong (b) Right
7. 7.Last-digit check: is 440 + 756 = 1196 right or wrong? (a) Wrong (b) Right
8. 8.Last-digit check: is 37 × 27 = 999 right or wrong? (a) Wrong (b) Right
9. 9.Last-digit check: is 98 × 74 = 7252 right or wrong? (a) Wrong (b) Right
10. 10.Last-digit check: is 12 × 18 = 216 right or wrong? (a) Right (b) Wrong
11. 11.Last-digit check: is 25 × 96 = 2409 right or wrong? (a) Right (b) Wrong
12. 12.Last-digit check: is 503 + 959 = 1454 right or wrong? (a) Wrong (b) Right
13. 13.Last-digit check: is 328 + 162 = 490 right or wrong? (a) Right (b) Wrong
14. 14.Last-digit check: is 73 × 15 = 1094 right or wrong? (a) Right (b) Wrong
15. 15.Last-digit check: is 762 + 842 = 1606 right or wrong? (a) Wrong (b) Right
16. 16.Last-digit check: is 712 + 783 = 1495 right or wrong? (a) Wrong (b) Right
17. 17.Last-digit check: is 23 × 16 = 368 right or wrong? (a) Right (b) Wrong
18. 18.Last-digit check: is 209 + 607 = 816 right or wrong? (a) Wrong (b) Right
19. 19.Last-digit check: is 82 × 35 = 2864 right or wrong? (a) Right (b) Wrong
20. 20.Last-digit check: is 43 × 32 = 1376 right or wrong? (a) Wrong (b) Right
21. 21.Last-digit check: is 107 + 171 = 278 right or wrong? (a) Wrong (b) Right
22. 22.Last-digit check: is 25 × 21 = 525 right or wrong? (a) Wrong (b) Right
23. 23.Last-digit check: is 47 × 24 = 1128 right or wrong? (a) Right (b) Wrong
24. 24.Last-digit check: is 12 × 50 = 600 right or wrong? (a) Wrong (b) Right
25. 25.Last-digit check: is 34 × 50 = 1700 right or wrong? (a) Wrong (b) Right
26. 26.Last-digit check: is 722 + 244 = 964 right or wrong? (a) Right (b) Wrong
27. 27.Last-digit check: is 35 × 90 = 3141 right or wrong? (a) Wrong (b) Right
28. 28.Last-digit check: is 82 × 28 = 2301 right or wrong? (a) Right (b) Wrong
29. 29.Last-digit check: is 74 × 22 = 1621 right or wrong? (a) Right (b) Wrong
30. 30.Last-digit check: is 45 × 94 = 4230 right or wrong? (a) Right (b) Wrong
31. 31.Last-digit check: is 658 + 869 = 1527 right or wrong? (a) Wrong (b) Right
32. 32.Last-digit check: is 73 × 72 = 5249 right or wrong? (a) Right (b) Wrong
33. 33.Last-digit check: is 87 × 13 = 1131 right or wrong? (a) Right (b) Wrong
34. 34.Last-digit check: is 797 + 385 = 1182 right or wrong? (a) Wrong (b) Right
35. 35.Last-digit check: is 92 × 24 = 2208 right or wrong? (a) Wrong (b) Right
36. 36.Last-digit check: is 21 × 22 = 459 right or wrong? (a) Right (b) Wrong
37. 37.Last-digit check: is 36 × 25 = 899 right or wrong? (a) Wrong (b) Right
38. 38.Last-digit check: is 90 × 45 = 4050 right or wrong? (a) Right (b) Wrong
39. 39.Last-digit check: is 12 × 74 = 888 right or wrong? (a) Wrong (b) Right
40. 40.Last-digit check: is 46 × 19 = 874 right or wrong? (a) Right (b) Wrong

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