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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 881 · 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. 1.32² =
  2. 2.97² =
  3. 3.64² =
  4. 4.55² =
  5. 5.82² =
  6. 6.38² =
  7. 7.99² =
  8. 8.47² =
  9. 9.71² =
  10. 10.66² =
  11. 11.92² =
  12. 12.54² =
  13. 13.63² =
  14. 14.42² =
  15. 15.88² =
  16. 16.41² =
  17. 17.81² =
  18. 18.78² =
  19. 19.67² =
  20. 20.43² =
  21. 21.51² =
  22. 22.69² =
  23. 23.62² =
  24. 24.56² =
  25. 25.89² =
  26. 26.31² =
  27. 27.48² =
  28. 28.72² =
  29. 29.45² =
  30. 30.58² =
  31. 31.39² =
  32. 32.49² =
  33. 33.57² =
  34. 34.59² =
  35. 35.65² =
  36. 36.73² =
  37. 37.61² =
  38. 38.94² =
  39. 39.93² =
  40. 40.91² =

Answer key

  1. 1024
  2. 9409
  3. 4096
  4. 3025
  5. 6724
  6. 1444
  7. 9801
  8. 2209
  9. 5041
  10. 4356
  11. 8464
  12. 2916
  13. 3969
  14. 1764
  15. 7744
  16. 1681
  17. 6561
  18. 6084
  19. 4489
  20. 1849
  21. 2601
  22. 4761
  23. 3844
  24. 3136
  25. 7921
  26. 961
  27. 2304
  28. 5184
  29. 2025
  30. 3364
  31. 1521
  32. 2401
  33. 3249
  34. 3481
  35. 4225
  36. 5329
  37. 3721
  38. 8836
  39. 8649
  40. 8281

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