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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 213 · 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. 1.51² =
  2. 2.52² =
  3. 3.94² =
  4. 4.41² =
  5. 5.44² =
  6. 6.73² =
  7. 7.72² =
  8. 8.49² =
  9. 9.35² =
  10. 10.46² =
  11. 11.62² =
  12. 12.43² =
  13. 13.36² =
  14. 14.84² =
  15. 15.71² =
  16. 16.33² =
  17. 17.31² =
  18. 18.82² =
  19. 19.45² =
  20. 20.38² =
  21. 21.61² =
  22. 22.42² =
  23. 23.53² =
  24. 24.81² =
  25. 25.86² =
  26. 26.63² =
  27. 27.47² =
  28. 28.92² =
  29. 29.56² =
  30. 30.55² =
  31. 31.99² =
  32. 32.75² =
  33. 33.64² =
  34. 34.67² =
  35. 35.85² =
  36. 36.69² =
  37. 37.54² =
  38. 38.98² =
  39. 39.91² =
  40. 40.34² =

Answer key

  1. 2601
  2. 2704
  3. 8836
  4. 1681
  5. 1936
  6. 5329
  7. 5184
  8. 2401
  9. 1225
  10. 2116
  11. 3844
  12. 1849
  13. 1296
  14. 7056
  15. 5041
  16. 1089
  17. 961
  18. 6724
  19. 2025
  20. 1444
  21. 3721
  22. 1764
  23. 2809
  24. 6561
  25. 7396
  26. 3969
  27. 2209
  28. 8464
  29. 3136
  30. 3025
  31. 9801
  32. 5625
  33. 4096
  34. 4489
  35. 7225
  36. 4761
  37. 2916
  38. 9604
  39. 8281
  40. 1156

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