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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 729 · 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. 1.77² =
  2. 2.38² =
  3. 3.85² =
  4. 4.73² =
  5. 5.55² =
  6. 6.42² =
  7. 7.67² =
  8. 8.89² =
  9. 9.32² =
  10. 10.62² =
  11. 11.68² =
  12. 12.49² =
  13. 13.75² =
  14. 14.43² =
  15. 15.37² =
  16. 16.58² =
  17. 17.65² =
  18. 18.33² =
  19. 19.91² =
  20. 20.82² =
  21. 21.56² =
  22. 22.35² =
  23. 23.46² =
  24. 24.97² =
  25. 25.81² =
  26. 26.79² =
  27. 27.41² =
  28. 28.84² =
  29. 29.87² =
  30. 30.74² =
  31. 31.44² =
  32. 32.78² =
  33. 33.69² =
  34. 34.93² =
  35. 35.88² =
  36. 36.63² =
  37. 37.98² =
  38. 38.64² =
  39. 39.71² =
  40. 40.54² =

Answer key

  1. 5929
  2. 1444
  3. 7225
  4. 5329
  5. 3025
  6. 1764
  7. 4489
  8. 7921
  9. 1024
  10. 3844
  11. 4624
  12. 2401
  13. 5625
  14. 1849
  15. 1369
  16. 3364
  17. 4225
  18. 1089
  19. 8281
  20. 6724
  21. 3136
  22. 1225
  23. 2116
  24. 9409
  25. 6561
  26. 6241
  27. 1681
  28. 7056
  29. 7569
  30. 5476
  31. 1936
  32. 6084
  33. 4761
  34. 8649
  35. 7744
  36. 3969
  37. 9604
  38. 4096
  39. 5041
  40. 2916

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