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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 943 · 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. 1.44² =
  2. 2.41² =
  3. 3.39² =
  4. 4.36² =
  5. 5.78² =
  6. 6.42² =
  7. 7.96² =
  8. 8.92² =
  9. 9.86² =
  10. 10.68² =
  11. 11.73² =
  12. 12.45² =
  13. 13.67² =
  14. 14.32² =
  15. 15.81² =
  16. 16.54² =
  17. 17.62² =
  18. 18.31² =
  19. 19.37² =
  20. 20.89² =
  21. 21.63² =
  22. 22.82² =
  23. 23.87² =
  24. 24.88² =
  25. 25.79² =
  26. 26.97² =
  27. 27.52² =
  28. 28.35² =
  29. 29.56² =
  30. 30.61² =
  31. 31.51² =
  32. 32.55² =
  33. 33.94² =
  34. 34.93² =
  35. 35.66² =
  36. 36.43² =
  37. 37.33² =
  38. 38.98² =
  39. 39.53² =
  40. 40.47² =

Answer key

  1. 1936
  2. 1681
  3. 1521
  4. 1296
  5. 6084
  6. 1764
  7. 9216
  8. 8464
  9. 7396
  10. 4624
  11. 5329
  12. 2025
  13. 4489
  14. 1024
  15. 6561
  16. 2916
  17. 3844
  18. 961
  19. 1369
  20. 7921
  21. 3969
  22. 6724
  23. 7569
  24. 7744
  25. 6241
  26. 9409
  27. 2704
  28. 1225
  29. 3136
  30. 3721
  31. 2601
  32. 3025
  33. 8836
  34. 8649
  35. 4356
  36. 1849
  37. 1089
  38. 9604
  39. 2809
  40. 2209

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