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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 760 · 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. 1.63² =
  2. 2.67² =
  3. 3.74² =
  4. 4.62² =
  5. 5.86² =
  6. 6.84² =
  7. 7.44² =
  8. 8.85² =
  9. 9.59² =
  10. 10.83² =
  11. 11.42² =
  12. 12.79² =
  13. 13.73² =
  14. 14.38² =
  15. 15.39² =
  16. 16.92² =
  17. 17.94² =
  18. 18.81² =
  19. 19.49² =
  20. 20.96² =
  21. 21.53² =
  22. 22.91² =
  23. 23.31² =
  24. 24.33² =
  25. 25.77² =
  26. 26.78² =
  27. 27.82² =
  28. 28.36² =
  29. 29.95² =
  30. 30.46² =
  31. 31.35² =
  32. 32.88² =
  33. 33.99² =
  34. 34.58² =
  35. 35.65² =
  36. 36.87² =
  37. 37.61² =
  38. 38.98² =
  39. 39.71² =
  40. 40.41² =

Answer key

  1. 3969
  2. 4489
  3. 5476
  4. 3844
  5. 7396
  6. 7056
  7. 1936
  8. 7225
  9. 3481
  10. 6889
  11. 1764
  12. 6241
  13. 5329
  14. 1444
  15. 1521
  16. 8464
  17. 8836
  18. 6561
  19. 2401
  20. 9216
  21. 2809
  22. 8281
  23. 961
  24. 1089
  25. 5929
  26. 6084
  27. 6724
  28. 1296
  29. 9025
  30. 2116
  31. 1225
  32. 7744
  33. 9801
  34. 3364
  35. 4225
  36. 7569
  37. 3721
  38. 9604
  39. 5041
  40. 1681

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