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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 333 · 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. 1.89² =
  2. 2.75² =
  3. 3.87² =
  4. 4.83² =
  5. 5.38² =
  6. 6.63² =
  7. 7.74² =
  8. 8.53² =
  9. 9.97² =
  10. 10.47² =
  11. 11.51² =
  12. 12.92² =
  13. 13.77² =
  14. 14.99² =
  15. 15.46² =
  16. 16.82² =
  17. 17.81² =
  18. 18.61² =
  19. 19.42² =
  20. 20.48² =
  21. 21.33² =
  22. 22.59² =
  23. 23.76² =
  24. 24.49² =
  25. 25.73² =
  26. 26.98² =
  27. 27.35² =
  28. 28.54² =
  29. 29.67² =
  30. 30.41² =
  31. 31.71² =
  32. 32.55² =
  33. 33.62² =
  34. 34.65² =
  35. 35.45² =
  36. 36.84² =
  37. 37.36² =
  38. 38.44² =
  39. 39.78² =
  40. 40.43² =

Answer key

  1. 7921
  2. 5625
  3. 7569
  4. 6889
  5. 1444
  6. 3969
  7. 5476
  8. 2809
  9. 9409
  10. 2209
  11. 2601
  12. 8464
  13. 5929
  14. 9801
  15. 2116
  16. 6724
  17. 6561
  18. 3721
  19. 1764
  20. 2304
  21. 1089
  22. 3481
  23. 5776
  24. 2401
  25. 5329
  26. 9604
  27. 1225
  28. 2916
  29. 4489
  30. 1681
  31. 5041
  32. 3025
  33. 3844
  34. 4225
  35. 2025
  36. 7056
  37. 1296
  38. 1936
  39. 6084
  40. 1849

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