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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 903 · 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. 2.64² =
  3. 3.41² =
  4. 4.42² =
  5. 5.49² =
  6. 6.81² =
  7. 7.43² =
  8. 8.48² =
  9. 9.85² =
  10. 10.91² =
  11. 11.44² =
  12. 12.37² =
  13. 13.71² =
  14. 14.72² =
  15. 15.82² =
  16. 16.46² =
  17. 17.63² =
  18. 18.36² =
  19. 19.93² =
  20. 20.83² =
  21. 21.73² =
  22. 22.79² =
  23. 23.61² =
  24. 24.75² =
  25. 25.74² =
  26. 26.84² =
  27. 27.35² =
  28. 28.94² =
  29. 29.33² =
  30. 30.39² =
  31. 31.65² =
  32. 32.98² =
  33. 33.88² =
  34. 34.32² =
  35. 35.55² =
  36. 36.45² =
  37. 37.78² =
  38. 38.52² =
  39. 39.31² =
  40. 40.62² =

Answer key

  1. 2601
  2. 4096
  3. 1681
  4. 1764
  5. 2401
  6. 6561
  7. 1849
  8. 2304
  9. 7225
  10. 8281
  11. 1936
  12. 1369
  13. 5041
  14. 5184
  15. 6724
  16. 2116
  17. 3969
  18. 1296
  19. 8649
  20. 6889
  21. 5329
  22. 6241
  23. 3721
  24. 5625
  25. 5476
  26. 7056
  27. 1225
  28. 8836
  29. 1089
  30. 1521
  31. 4225
  32. 9604
  33. 7744
  34. 1024
  35. 3025
  36. 2025
  37. 6084
  38. 2704
  39. 961
  40. 3844

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