Casting Out Nines Worksheet

Speed calculation lesson 13: Check it with nines · Set 467 · 40 questions

The fast method (Casting out nines): Find the nine-check number of each number: add the digits until one digit is left. Do the same sum (× or +) with those digits and shrink the result to one digit too. Shrink the given answer. Different → wrong. Same → it passes the check.

1. 1.Check with nines: 606 + 741 = 1347. Correct or wrong? (a) wrong (b) correct
2. 2.Check with nines: 50 × 67 = 3350. Correct or wrong? (a) correct (b) wrong
3. 3.Check with nines: 741 + 561 = 1304. Correct or wrong? (a) correct (b) wrong
4. 4.Check with nines: 852 + 947 = 1802. Correct or wrong? (a) wrong (b) correct
5. 5.Check with nines: 18 × 36 = 642. Correct or wrong? (a) wrong (b) correct
6. 6.Check with nines: 73 × 48 = 3504. Correct or wrong? (a) wrong (b) correct
7. 7.Check with nines: 370 + 441 = 818. Correct or wrong? (a) correct (b) wrong
8. 8.Check with nines: 809 + 208 = 1025. Correct or wrong? (a) wrong (b) correct
9. 9.Check with nines: 135 + 848 = 990. Correct or wrong? (a) correct (b) wrong
10. 10.Check with nines: 56 × 80 = 4480. Correct or wrong? (a) wrong (b) correct
11. 11.Check with nines: 229 + 532 = 761. Correct or wrong? (a) wrong (b) correct
12. 12.Check with nines: 31 × 87 = 2697. Correct or wrong? (a) correct (b) wrong
13. 13.Check with nines: 156 + 693 = 849. Correct or wrong? (a) correct (b) wrong
14. 14.Check with nines: 327 + 162 = 492. Correct or wrong? (a) wrong (b) correct
15. 15.Check with nines: 603 + 850 = 1453. Correct or wrong? (a) wrong (b) correct
16. 16.Check with nines: 61 × 45 = 2745. Correct or wrong? (a) correct (b) wrong
17. 17.Check with nines: 32 × 97 = 3096. Correct or wrong? (a) wrong (b) correct
18. 18.Check with nines: 21 × 24 = 509. Correct or wrong? (a) wrong (b) correct
19. 19.Check with nines: 253 + 788 = 1036. Correct or wrong? (a) wrong (b) correct
20. 20.Check with nines: 350 + 609 = 964. Correct or wrong? (a) correct (b) wrong
21. 21.Check with nines: 376 + 141 = 509. Correct or wrong? (a) wrong (b) correct
22. 22.Check with nines: 40 × 19 = 759. Correct or wrong? (a) correct (b) wrong
23. 23.Check with nines: 415 + 704 = 1119. Correct or wrong? (a) wrong (b) correct
24. 24.Check with nines: 851 + 894 = 1745. Correct or wrong? (a) correct (b) wrong
25. 25.Check with nines: 420 + 167 = 581. Correct or wrong? (a) correct (b) wrong
26. 26.Check with nines: 44 × 44 = 1936. Correct or wrong? (a) correct (b) wrong
27. 27.Check with nines: 357 + 248 = 605. Correct or wrong? (a) wrong (b) correct
28. 28.Check with nines: 28 × 69 = 1932. Correct or wrong? (a) correct (b) wrong
29. 29.Check with nines: 31 × 37 = 1154. Correct or wrong? (a) wrong (b) correct
30. 30.Check with nines: 16 × 38 = 608. Correct or wrong? (a) wrong (b) correct
31. 31.Check with nines: 44 × 30 = 1328. Correct or wrong? (a) wrong (b) correct
32. 32.Check with nines: 51 × 33 = 1691. Correct or wrong? (a) wrong (b) correct
33. 33.Check with nines: 196 + 526 = 714. Correct or wrong? (a) correct (b) wrong
34. 34.Check with nines: 98 × 24 = 2357. Correct or wrong? (a) wrong (b) correct
35. 35.Check with nines: 47 × 61 = 2873. Correct or wrong? (a) wrong (b) correct
36. 36.Check with nines: 252 + 554 = 801. Correct or wrong? (a) wrong (b) correct
37. 37.Check with nines: 21 × 60 = 1263. Correct or wrong? (a) correct (b) wrong
38. 38.Check with nines: 33 × 33 = 1089. Correct or wrong? (a) correct (b) wrong
39. 39.Check with nines: 26 × 27 = 702. Correct or wrong? (a) wrong (b) correct
40. 40.Check with nines: 602 + 882 = 1484. Correct or wrong? (a) correct (b) wrong

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