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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 848 · 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. 1.95² =
  2. 2.77² =
  3. 3.63² =
  4. 4.73² =
  5. 5.79² =
  6. 6.49² =
  7. 7.33² =
  8. 8.93² =
  9. 9.98² =
  10. 10.44² =
  11. 11.59² =
  12. 12.62² =
  13. 13.34² =
  14. 14.99² =
  15. 15.88² =
  16. 16.46² =
  17. 17.41² =
  18. 18.57² =
  19. 19.53² =
  20. 20.43² =
  21. 21.97² =
  22. 22.55² =
  23. 23.83² =
  24. 24.72² =
  25. 25.91² =
  26. 26.66² =
  27. 27.61² =
  28. 28.31² =
  29. 29.81² =
  30. 30.32² =
  31. 31.75² =
  32. 32.65² =
  33. 33.39² =
  34. 34.64² =
  35. 35.52² =
  36. 36.38² =
  37. 37.51² =
  38. 38.56² =
  39. 39.71² =
  40. 40.86² =

Answer key

  1. 9025
  2. 5929
  3. 3969
  4. 5329
  5. 6241
  6. 2401
  7. 1089
  8. 8649
  9. 9604
  10. 1936
  11. 3481
  12. 3844
  13. 1156
  14. 9801
  15. 7744
  16. 2116
  17. 1681
  18. 3249
  19. 2809
  20. 1849
  21. 9409
  22. 3025
  23. 6889
  24. 5184
  25. 8281
  26. 4356
  27. 3721
  28. 961
  29. 6561
  30. 1024
  31. 5625
  32. 4225
  33. 1521
  34. 4096
  35. 2704
  36. 1444
  37. 2601
  38. 3136
  39. 5041
  40. 7396

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