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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 346 · 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. 1.44² =
  2. 2.75² =
  3. 3.46² =
  4. 4.37² =
  5. 5.88² =
  6. 6.41² =
  7. 7.31² =
  8. 8.99² =
  9. 9.43² =
  10. 10.51² =
  11. 11.98² =
  12. 12.36² =
  13. 13.73² =
  14. 14.38² =
  15. 15.65² =
  16. 16.45² =
  17. 17.81² =
  18. 18.86² =
  19. 19.74² =
  20. 20.62² =
  21. 21.56² =
  22. 22.66² =
  23. 23.91² =
  24. 24.79² =
  25. 25.77² =
  26. 26.96² =
  27. 27.33² =
  28. 28.35² =
  29. 29.55² =
  30. 30.39² =
  31. 31.42² =
  32. 32.85² =
  33. 33.32² =
  34. 34.59² =
  35. 35.71² =
  36. 36.54² =
  37. 37.68² =
  38. 38.94² =
  39. 39.48² =
  40. 40.58² =

Answer key

  1. 1936
  2. 5625
  3. 2116
  4. 1369
  5. 7744
  6. 1681
  7. 961
  8. 9801
  9. 1849
  10. 2601
  11. 9604
  12. 1296
  13. 5329
  14. 1444
  15. 4225
  16. 2025
  17. 6561
  18. 7396
  19. 5476
  20. 3844
  21. 3136
  22. 4356
  23. 8281
  24. 6241
  25. 5929
  26. 9216
  27. 1089
  28. 1225
  29. 3025
  30. 1521
  31. 1764
  32. 7225
  33. 1024
  34. 3481
  35. 5041
  36. 2916
  37. 4624
  38. 8836
  39. 2304
  40. 3364

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