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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 896 · 40 questions
TalentJR

How to do it in your head (Up and down): Find how far the number is from the nearest ten (the distance). Go that distance up and the same distance down, and multiply the two new numbers. Add the distance squared.

NameDateTime takenScore ___ / 40
  1. 1.48² =
  2. 2.91² =
  3. 3.62² =
  4. 4.61² =
  5. 5.76² =
  6. 6.35² =
  7. 7.72² =
  8. 8.75² =
  9. 9.51² =
  10. 10.65² =
  11. 11.38² =
  12. 12.81² =
  13. 13.73² =
  14. 14.71² =
  15. 15.67² =
  16. 16.68² =
  17. 17.34² =
  18. 18.52² =
  19. 19.58² =
  20. 20.32² =
  21. 21.36² =
  22. 22.41² =
  23. 23.39² =
  24. 24.44² =
  25. 25.59² =
  26. 26.99² =
  27. 27.37² =
  28. 28.77² =
  29. 29.43² =
  30. 30.64² =
  31. 31.66² =
  32. 32.57² =
  33. 33.63² =
  34. 34.54² =
  35. 35.97² =
  36. 36.92² =
  37. 37.98² =
  38. 38.89² =
  39. 39.94² =
  40. 40.42² =

Answer key

  1. 2304
  2. 8281
  3. 3844
  4. 3721
  5. 5776
  6. 1225
  7. 5184
  8. 5625
  9. 2601
  10. 4225
  11. 1444
  12. 6561
  13. 5329
  14. 5041
  15. 4489
  16. 4624
  17. 1156
  18. 2704
  19. 3364
  20. 1024
  21. 1296
  22. 1681
  23. 1521
  24. 1936
  25. 3481
  26. 9801
  27. 1369
  28. 5929
  29. 1849
  30. 4096
  31. 4356
  32. 3249
  33. 3969
  34. 2916
  35. 9409
  36. 8464
  37. 9604
  38. 7921
  39. 8836
  40. 1764

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