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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 897 · 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. 1.48² =
  2. 2.81² =
  3. 3.46² =
  4. 4.31² =
  5. 5.93² =
  6. 6.91² =
  7. 7.84² =
  8. 8.58² =
  9. 9.53² =
  10. 10.75² =
  11. 11.32² =
  12. 12.85² =
  13. 13.86² =
  14. 14.49² =
  15. 15.56² =
  16. 16.45² =
  17. 17.36² =
  18. 18.63² =
  19. 19.74² =
  20. 20.51² =
  21. 21.39² =
  22. 22.94² =
  23. 23.69² =
  24. 24.44² =
  25. 25.41² =
  26. 26.73² =
  27. 27.47² =
  28. 28.43² =
  29. 29.35² =
  30. 30.65² =
  31. 31.55² =
  32. 32.78² =
  33. 33.37² =
  34. 34.59² =
  35. 35.98² =
  36. 36.33² =
  37. 37.62² =
  38. 38.67² =
  39. 39.96² =
  40. 40.77² =

Answer key

  1. 2304
  2. 6561
  3. 2116
  4. 961
  5. 8649
  6. 8281
  7. 7056
  8. 3364
  9. 2809
  10. 5625
  11. 1024
  12. 7225
  13. 7396
  14. 2401
  15. 3136
  16. 2025
  17. 1296
  18. 3969
  19. 5476
  20. 2601
  21. 1521
  22. 8836
  23. 4761
  24. 1936
  25. 1681
  26. 5329
  27. 2209
  28. 1849
  29. 1225
  30. 4225
  31. 3025
  32. 6084
  33. 1369
  34. 3481
  35. 9604
  36. 1089
  37. 3844
  38. 4489
  39. 9216
  40. 5929

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