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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 842 · 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. 1.98² =
  2. 2.93² =
  3. 3.54² =
  4. 4.61² =
  5. 5.49² =
  6. 6.89² =
  7. 7.51² =
  8. 8.91² =
  9. 9.71² =
  10. 10.81² =
  11. 11.48² =
  12. 12.97² =
  13. 13.58² =
  14. 14.59² =
  15. 15.38² =
  16. 16.73² =
  17. 17.57² =
  18. 18.62² =
  19. 19.47² =
  20. 20.79² =
  21. 21.84² =
  22. 22.32² =
  23. 23.87² =
  24. 24.99² =
  25. 25.33² =
  26. 26.82² =
  27. 27.94² =
  28. 28.85² =
  29. 29.39² =
  30. 30.43² =
  31. 31.34² =
  32. 32.67² =
  33. 33.31² =
  34. 34.88² =
  35. 35.65² =
  36. 36.68² =
  37. 37.83² =
  38. 38.56² =
  39. 39.41² =
  40. 40.44² =

Answer key

  1. 9604
  2. 8649
  3. 2916
  4. 3721
  5. 2401
  6. 7921
  7. 2601
  8. 8281
  9. 5041
  10. 6561
  11. 2304
  12. 9409
  13. 3364
  14. 3481
  15. 1444
  16. 5329
  17. 3249
  18. 3844
  19. 2209
  20. 6241
  21. 7056
  22. 1024
  23. 7569
  24. 9801
  25. 1089
  26. 6724
  27. 8836
  28. 7225
  29. 1521
  30. 1849
  31. 1156
  32. 4489
  33. 961
  34. 7744
  35. 4225
  36. 4624
  37. 6889
  38. 3136
  39. 1681
  40. 1936

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