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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 887 · 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. 1.49² =
  2. 2.53² =
  3. 3.32² =
  4. 4.78² =
  5. 5.68² =
  6. 6.74² =
  7. 7.81² =
  8. 8.41² =
  9. 9.92² =
  10. 10.94² =
  11. 11.48² =
  12. 12.69² =
  13. 13.45² =
  14. 14.73² =
  15. 15.43² =
  16. 16.66² =
  17. 17.35² =
  18. 18.97² =
  19. 19.42² =
  20. 20.67² =
  21. 21.51² =
  22. 22.98² =
  23. 23.61² =
  24. 24.95² =
  25. 25.85² =
  26. 26.84² =
  27. 27.89² =
  28. 28.62² =
  29. 29.38² =
  30. 30.31² =
  31. 31.36² =
  32. 32.72² =
  33. 33.91² =
  34. 34.44² =
  35. 35.65² =
  36. 36.71² =
  37. 37.39² =
  38. 38.86² =
  39. 39.77² =
  40. 40.75² =

Answer key

  1. 2401
  2. 2809
  3. 1024
  4. 6084
  5. 4624
  6. 5476
  7. 6561
  8. 1681
  9. 8464
  10. 8836
  11. 2304
  12. 4761
  13. 2025
  14. 5329
  15. 1849
  16. 4356
  17. 1225
  18. 9409
  19. 1764
  20. 4489
  21. 2601
  22. 9604
  23. 3721
  24. 9025
  25. 7225
  26. 7056
  27. 7921
  28. 3844
  29. 1444
  30. 961
  31. 1296
  32. 5184
  33. 8281
  34. 1936
  35. 4225
  36. 5041
  37. 1521
  38. 7396
  39. 5929
  40. 5625

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