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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 527 · 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. 1.31² =
  2. 2.74² =
  3. 3.94² =
  4. 4.53² =
  5. 5.92² =
  6. 6.81² =
  7. 7.59² =
  8. 8.85² =
  9. 9.43² =
  10. 10.57² =
  11. 11.49² =
  12. 12.76² =
  13. 13.58² =
  14. 14.35² =
  15. 15.75² =
  16. 16.39² =
  17. 17.84² =
  18. 18.71² =
  19. 19.78² =
  20. 20.37² =
  21. 21.99² =
  22. 22.77² =
  23. 23.45² =
  24. 24.73² =
  25. 25.52² =
  26. 26.62² =
  27. 27.56² =
  28. 28.55² =
  29. 29.33² =
  30. 30.38² =
  31. 31.32² =
  32. 32.42² =
  33. 33.36² =
  34. 34.41² =
  35. 35.96² =
  36. 36.82² =
  37. 37.72² =
  38. 38.95² =
  39. 39.91² =
  40. 40.61² =

Answer key

  1. 961
  2. 5476
  3. 8836
  4. 2809
  5. 8464
  6. 6561
  7. 3481
  8. 7225
  9. 1849
  10. 3249
  11. 2401
  12. 5776
  13. 3364
  14. 1225
  15. 5625
  16. 1521
  17. 7056
  18. 5041
  19. 6084
  20. 1369
  21. 9801
  22. 5929
  23. 2025
  24. 5329
  25. 2704
  26. 3844
  27. 3136
  28. 3025
  29. 1089
  30. 1444
  31. 1024
  32. 1764
  33. 1296
  34. 1681
  35. 9216
  36. 6724
  37. 5184
  38. 9025
  39. 8281
  40. 3721

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