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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 762 · 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. 1.62² =
  2. 2.45² =
  3. 3.43² =
  4. 4.75² =
  5. 5.32² =
  6. 6.71² =
  7. 7.85² =
  8. 8.61² =
  9. 9.92² =
  10. 10.65² =
  11. 11.78² =
  12. 12.46² =
  13. 13.56² =
  14. 14.98² =
  15. 15.64² =
  16. 16.91² =
  17. 17.54² =
  18. 18.36² =
  19. 19.77² =
  20. 20.39² =
  21. 21.42² =
  22. 22.97² =
  23. 23.38² =
  24. 24.31² =
  25. 25.47² =
  26. 26.83² =
  27. 27.35² =
  28. 28.33² =
  29. 29.58² =
  30. 30.79² =
  31. 31.53² =
  32. 32.87² =
  33. 33.41² =
  34. 34.82² =
  35. 35.49² =
  36. 36.69² =
  37. 37.37² =
  38. 38.67² =
  39. 39.34² =
  40. 40.88² =

Answer key

  1. 3844
  2. 2025
  3. 1849
  4. 5625
  5. 1024
  6. 5041
  7. 7225
  8. 3721
  9. 8464
  10. 4225
  11. 6084
  12. 2116
  13. 3136
  14. 9604
  15. 4096
  16. 8281
  17. 2916
  18. 1296
  19. 5929
  20. 1521
  21. 1764
  22. 9409
  23. 1444
  24. 961
  25. 2209
  26. 6889
  27. 1225
  28. 1089
  29. 3364
  30. 6241
  31. 2809
  32. 7569
  33. 1681
  34. 6724
  35. 2401
  36. 4761
  37. 1369
  38. 4489
  39. 1156
  40. 7744

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