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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 501 · 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. 1.98² =
  2. 2.94² =
  3. 3.73² =
  4. 4.45² =
  5. 5.44² =
  6. 6.57² =
  7. 7.78² =
  8. 8.32² =
  9. 9.59² =
  10. 10.71² =
  11. 11.46² =
  12. 12.64² =
  13. 13.85² =
  14. 14.83² =
  15. 15.53² =
  16. 16.77² =
  17. 17.67² =
  18. 18.82² =
  19. 19.97² =
  20. 20.72² =
  21. 21.65² =
  22. 22.99² =
  23. 23.37² =
  24. 24.58² =
  25. 25.54² =
  26. 26.89² =
  27. 27.49² =
  28. 28.62² =
  29. 29.76² =
  30. 30.74² =
  31. 31.92² =
  32. 32.63² =
  33. 33.68² =
  34. 34.41² =
  35. 35.66² =
  36. 36.55² =
  37. 37.81² =
  38. 38.39² =
  39. 39.96² =
  40. 40.75² =

Answer key

  1. 9604
  2. 8836
  3. 5329
  4. 2025
  5. 1936
  6. 3249
  7. 6084
  8. 1024
  9. 3481
  10. 5041
  11. 2116
  12. 4096
  13. 7225
  14. 6889
  15. 2809
  16. 5929
  17. 4489
  18. 6724
  19. 9409
  20. 5184
  21. 4225
  22. 9801
  23. 1369
  24. 3364
  25. 2916
  26. 7921
  27. 2401
  28. 3844
  29. 5776
  30. 5476
  31. 8464
  32. 3969
  33. 4624
  34. 1681
  35. 4356
  36. 3025
  37. 6561
  38. 1521
  39. 9216
  40. 5625

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