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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 283 · 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. 1.61² =
  2. 2.69² =
  3. 3.79² =
  4. 4.98² =
  5. 5.75² =
  6. 6.62² =
  7. 7.37² =
  8. 8.96² =
  9. 9.92² =
  10. 10.71² =
  11. 11.81² =
  12. 12.31² =
  13. 13.54² =
  14. 14.87² =
  15. 15.89² =
  16. 16.85² =
  17. 17.53² =
  18. 18.47² =
  19. 19.44² =
  20. 20.33² =
  21. 21.41² =
  22. 22.72² =
  23. 23.59² =
  24. 24.46² =
  25. 25.65² =
  26. 26.84² =
  27. 27.56² =
  28. 28.73² =
  29. 29.42² =
  30. 30.91² =
  31. 31.32² =
  32. 32.76² =
  33. 33.55² =
  34. 34.38² =
  35. 35.93² =
  36. 36.88² =
  37. 37.49² =
  38. 38.97² =
  39. 39.86² =
  40. 40.51² =

Answer key

  1. 3721
  2. 4761
  3. 6241
  4. 9604
  5. 5625
  6. 3844
  7. 1369
  8. 9216
  9. 8464
  10. 5041
  11. 6561
  12. 961
  13. 2916
  14. 7569
  15. 7921
  16. 7225
  17. 2809
  18. 2209
  19. 1936
  20. 1089
  21. 1681
  22. 5184
  23. 3481
  24. 2116
  25. 4225
  26. 7056
  27. 3136
  28. 5329
  29. 1764
  30. 8281
  31. 1024
  32. 5776
  33. 3025
  34. 1444
  35. 8649
  36. 7744
  37. 2401
  38. 9409
  39. 7396
  40. 2601

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