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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 269 · 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. 1.61² =
  2. 2.81² =
  3. 3.53² =
  4. 4.92² =
  5. 5.96² =
  6. 6.54² =
  7. 7.97² =
  8. 8.46² =
  9. 9.43² =
  10. 10.98² =
  11. 11.35² =
  12. 12.59² =
  13. 13.39² =
  14. 14.82² =
  15. 15.44² =
  16. 16.41² =
  17. 17.37² =
  18. 18.85² =
  19. 19.47² =
  20. 20.94² =
  21. 21.77² =
  22. 22.66² =
  23. 23.31² =
  24. 24.38² =
  25. 25.73² =
  26. 26.83² =
  27. 27.72² =
  28. 28.67² =
  29. 29.74² =
  30. 30.71² =
  31. 31.36² =
  32. 32.45² =
  33. 33.69² =
  34. 34.55² =
  35. 35.78² =
  36. 36.42² =
  37. 37.57² =
  38. 38.32² =
  39. 39.65² =
  40. 40.93² =

Answer key

  1. 3721
  2. 6561
  3. 2809
  4. 8464
  5. 9216
  6. 2916
  7. 9409
  8. 2116
  9. 1849
  10. 9604
  11. 1225
  12. 3481
  13. 1521
  14. 6724
  15. 1936
  16. 1681
  17. 1369
  18. 7225
  19. 2209
  20. 8836
  21. 5929
  22. 4356
  23. 961
  24. 1444
  25. 5329
  26. 6889
  27. 5184
  28. 4489
  29. 5476
  30. 5041
  31. 1296
  32. 2025
  33. 4761
  34. 3025
  35. 6084
  36. 1764
  37. 3249
  38. 1024
  39. 4225
  40. 8649

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