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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 930 · 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. 1.51² =
  2. 2.97² =
  3. 3.68² =
  4. 4.41² =
  5. 5.47² =
  6. 6.35² =
  7. 7.64² =
  8. 8.87² =
  9. 9.62² =
  10. 10.76² =
  11. 11.81² =
  12. 12.34² =
  13. 13.74² =
  14. 14.49² =
  15. 15.67² =
  16. 16.92² =
  17. 17.38² =
  18. 18.61² =
  19. 19.73² =
  20. 20.44² =
  21. 21.88² =
  22. 22.89² =
  23. 23.99² =
  24. 24.85² =
  25. 25.45² =
  26. 26.43² =
  27. 27.48² =
  28. 28.71² =
  29. 29.31² =
  30. 30.77² =
  31. 31.52² =
  32. 32.66² =
  33. 33.58² =
  34. 34.42² =
  35. 35.56² =
  36. 36.54² =
  37. 37.72² =
  38. 38.91² =
  39. 39.59² =
  40. 40.33² =

Answer key

  1. 2601
  2. 9409
  3. 4624
  4. 1681
  5. 2209
  6. 1225
  7. 4096
  8. 7569
  9. 3844
  10. 5776
  11. 6561
  12. 1156
  13. 5476
  14. 2401
  15. 4489
  16. 8464
  17. 1444
  18. 3721
  19. 5329
  20. 1936
  21. 7744
  22. 7921
  23. 9801
  24. 7225
  25. 2025
  26. 1849
  27. 2304
  28. 5041
  29. 961
  30. 5929
  31. 2704
  32. 4356
  33. 3364
  34. 1764
  35. 3136
  36. 2916
  37. 5184
  38. 8281
  39. 3481
  40. 1089

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