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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 855 · 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. 1.47² =
  2. 2.79² =
  3. 3.51² =
  4. 4.52² =
  5. 5.32² =
  6. 6.66² =
  7. 7.53² =
  8. 8.81² =
  9. 9.84² =
  10. 10.88² =
  11. 11.44² =
  12. 12.96² =
  13. 13.42² =
  14. 14.41² =
  15. 15.95² =
  16. 16.65² =
  17. 17.35² =
  18. 18.58² =
  19. 19.87² =
  20. 20.56² =
  21. 21.37² =
  22. 22.98² =
  23. 23.38² =
  24. 24.74² =
  25. 25.89² =
  26. 26.61² =
  27. 27.72² =
  28. 28.45² =
  29. 29.31² =
  30. 30.73² =
  31. 31.82² =
  32. 32.49² =
  33. 33.97² =
  34. 34.91² =
  35. 35.43² =
  36. 36.36² =
  37. 37.92² =
  38. 38.63² =
  39. 39.34² =
  40. 40.67² =

Answer key

  1. 2209
  2. 6241
  3. 2601
  4. 2704
  5. 1024
  6. 4356
  7. 2809
  8. 6561
  9. 7056
  10. 7744
  11. 1936
  12. 9216
  13. 1764
  14. 1681
  15. 9025
  16. 4225
  17. 1225
  18. 3364
  19. 7569
  20. 3136
  21. 1369
  22. 9604
  23. 1444
  24. 5476
  25. 7921
  26. 3721
  27. 5184
  28. 2025
  29. 961
  30. 5329
  31. 6724
  32. 2401
  33. 9409
  34. 8281
  35. 1849
  36. 1296
  37. 8464
  38. 3969
  39. 1156
  40. 4489

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