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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 866 · 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. 1.36² =
  2. 2.47² =
  3. 3.66² =
  4. 4.55² =
  5. 5.42² =
  6. 6.79² =
  7. 7.67² =
  8. 8.38² =
  9. 9.85² =
  10. 10.78² =
  11. 11.56² =
  12. 12.61² =
  13. 13.54² =
  14. 14.39² =
  15. 15.33² =
  16. 16.57² =
  17. 17.75² =
  18. 18.92² =
  19. 19.93² =
  20. 20.68² =
  21. 21.99² =
  22. 22.41² =
  23. 23.77² =
  24. 24.34² =
  25. 25.98² =
  26. 26.73² =
  27. 27.81² =
  28. 28.91² =
  29. 29.51² =
  30. 30.35² =
  31. 31.49² =
  32. 32.59² =
  33. 33.43² =
  34. 34.53² =
  35. 35.82² =
  36. 36.76² =
  37. 37.48² =
  38. 38.86² =
  39. 39.89² =
  40. 40.64² =

Answer key

  1. 1296
  2. 2209
  3. 4356
  4. 3025
  5. 1764
  6. 6241
  7. 4489
  8. 1444
  9. 7225
  10. 6084
  11. 3136
  12. 3721
  13. 2916
  14. 1521
  15. 1089
  16. 3249
  17. 5625
  18. 8464
  19. 8649
  20. 4624
  21. 9801
  22. 1681
  23. 5929
  24. 1156
  25. 9604
  26. 5329
  27. 6561
  28. 8281
  29. 2601
  30. 1225
  31. 2401
  32. 3481
  33. 1849
  34. 2809
  35. 6724
  36. 5776
  37. 2304
  38. 7396
  39. 7921
  40. 4096

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