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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 976 · 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. 1.46² =
  2. 2.83² =
  3. 3.73² =
  4. 4.31² =
  5. 5.41² =
  6. 6.64² =
  7. 7.75² =
  8. 8.51² =
  9. 9.85² =
  10. 10.43² =
  11. 11.54² =
  12. 12.67² =
  13. 13.65² =
  14. 14.97² =
  15. 15.91² =
  16. 16.87² =
  17. 17.88² =
  18. 18.74² =
  19. 19.76² =
  20. 20.89² =
  21. 21.56² =
  22. 22.45² =
  23. 23.77² =
  24. 24.49² =
  25. 25.71² =
  26. 26.32² =
  27. 27.72² =
  28. 28.39² =
  29. 29.58² =
  30. 30.63² =
  31. 31.98² =
  32. 32.37² =
  33. 33.94² =
  34. 34.62² =
  35. 35.57² =
  36. 36.79² =
  37. 37.33² =
  38. 38.99² =
  39. 39.34² =
  40. 40.66² =

Answer key

  1. 2116
  2. 6889
  3. 5329
  4. 961
  5. 1681
  6. 4096
  7. 5625
  8. 2601
  9. 7225
  10. 1849
  11. 2916
  12. 4489
  13. 4225
  14. 9409
  15. 8281
  16. 7569
  17. 7744
  18. 5476
  19. 5776
  20. 7921
  21. 3136
  22. 2025
  23. 5929
  24. 2401
  25. 5041
  26. 1024
  27. 5184
  28. 1521
  29. 3364
  30. 3969
  31. 9604
  32. 1369
  33. 8836
  34. 3844
  35. 3249
  36. 6241
  37. 1089
  38. 9801
  39. 1156
  40. 4356

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