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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 917 · 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. 1.71² =
  2. 2.51² =
  3. 3.43² =
  4. 4.87² =
  5. 5.66² =
  6. 6.42² =
  7. 7.98² =
  8. 8.65² =
  9. 9.64² =
  10. 10.85² =
  11. 11.34² =
  12. 12.88² =
  13. 13.53² =
  14. 14.59² =
  15. 15.94² =
  16. 16.54² =
  17. 17.41² =
  18. 18.91² =
  19. 19.82² =
  20. 20.79² =
  21. 21.52² =
  22. 22.78² =
  23. 23.73² =
  24. 24.96² =
  25. 25.44² =
  26. 26.45² =
  27. 27.92² =
  28. 28.74² =
  29. 29.99² =
  30. 30.81² =
  31. 31.47² =
  32. 32.76² =
  33. 33.89² =
  34. 34.69² =
  35. 35.36² =
  36. 36.39² =
  37. 37.83² =
  38. 38.31² =
  39. 39.67² =
  40. 40.77² =

Answer key

  1. 5041
  2. 2601
  3. 1849
  4. 7569
  5. 4356
  6. 1764
  7. 9604
  8. 4225
  9. 4096
  10. 7225
  11. 1156
  12. 7744
  13. 2809
  14. 3481
  15. 8836
  16. 2916
  17. 1681
  18. 8281
  19. 6724
  20. 6241
  21. 2704
  22. 6084
  23. 5329
  24. 9216
  25. 1936
  26. 2025
  27. 8464
  28. 5476
  29. 9801
  30. 6561
  31. 2209
  32. 5776
  33. 7921
  34. 4761
  35. 1296
  36. 1521
  37. 6889
  38. 961
  39. 4489
  40. 5929

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