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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 68 · 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. 1.34² =
  2. 2.33² =
  3. 3.35² =
  4. 4.85² =
  5. 5.61² =
  6. 6.38² =
  7. 7.92² =
  8. 8.32² =
  9. 9.79² =
  10. 10.62² =
  11. 11.88² =
  12. 12.48² =
  13. 13.86² =
  14. 14.31² =
  15. 15.59² =
  16. 16.54² =
  17. 17.71² =
  18. 18.45² =
  19. 19.42² =
  20. 20.49² =
  21. 21.93² =
  22. 22.43² =
  23. 23.72² =
  24. 24.44² =
  25. 25.76² =
  26. 26.96² =
  27. 27.56² =
  28. 28.51² =
  29. 29.98² =
  30. 30.94² =
  31. 31.84² =
  32. 32.87² =
  33. 33.78² =
  34. 34.41² =
  35. 35.73² =
  36. 36.89² =
  37. 37.65² =
  38. 38.53² =
  39. 39.39² =
  40. 40.36² =

Answer key

  1. 1156
  2. 1089
  3. 1225
  4. 7225
  5. 3721
  6. 1444
  7. 8464
  8. 1024
  9. 6241
  10. 3844
  11. 7744
  12. 2304
  13. 7396
  14. 961
  15. 3481
  16. 2916
  17. 5041
  18. 2025
  19. 1764
  20. 2401
  21. 8649
  22. 1849
  23. 5184
  24. 1936
  25. 5776
  26. 9216
  27. 3136
  28. 2601
  29. 9604
  30. 8836
  31. 7056
  32. 7569
  33. 6084
  34. 1681
  35. 5329
  36. 7921
  37. 4225
  38. 2809
  39. 1521
  40. 1296

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