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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 948 · 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. 1.89² =
  2. 2.99² =
  3. 3.58² =
  4. 4.95² =
  5. 5.52² =
  6. 6.96² =
  7. 7.72² =
  8. 8.61² =
  9. 9.75² =
  10. 10.88² =
  11. 11.93² =
  12. 12.54² =
  13. 13.45² =
  14. 14.44² =
  15. 15.49² =
  16. 16.83² =
  17. 17.69² =
  18. 18.82² =
  19. 19.62² =
  20. 20.48² =
  21. 21.65² =
  22. 22.43² =
  23. 23.56² =
  24. 24.51² =
  25. 25.73² =
  26. 26.41² =
  27. 27.81² =
  28. 28.38² =
  29. 29.31² =
  30. 30.57² =
  31. 31.76² =
  32. 32.74² =
  33. 33.71² =
  34. 34.39² =
  35. 35.36² =
  36. 36.33² =
  37. 37.94² =
  38. 38.53² =
  39. 39.86² =
  40. 40.35² =

Answer key

  1. 7921
  2. 9801
  3. 3364
  4. 9025
  5. 2704
  6. 9216
  7. 5184
  8. 3721
  9. 5625
  10. 7744
  11. 8649
  12. 2916
  13. 2025
  14. 1936
  15. 2401
  16. 6889
  17. 4761
  18. 6724
  19. 3844
  20. 2304
  21. 4225
  22. 1849
  23. 3136
  24. 2601
  25. 5329
  26. 1681
  27. 6561
  28. 1444
  29. 961
  30. 3249
  31. 5776
  32. 5476
  33. 5041
  34. 1521
  35. 1296
  36. 1089
  37. 8836
  38. 2809
  39. 7396
  40. 1225

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