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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 725 · 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. 1.99² =
  2. 2.56² =
  3. 3.38² =
  4. 4.67² =
  5. 5.32² =
  6. 6.73² =
  7. 7.51² =
  8. 8.69² =
  9. 9.85² =
  10. 10.36² =
  11. 11.47² =
  12. 12.55² =
  13. 13.49² =
  14. 14.71² =
  15. 15.75² =
  16. 16.42² =
  17. 17.96² =
  18. 18.65² =
  19. 19.86² =
  20. 20.77² =
  21. 21.63² =
  22. 22.41² =
  23. 23.39² =
  24. 24.84² =
  25. 25.81² =
  26. 26.93² =
  27. 27.52² =
  28. 28.66² =
  29. 29.98² =
  30. 30.31² =
  31. 31.82² =
  32. 32.94² =
  33. 33.45² =
  34. 34.74² =
  35. 35.61² =
  36. 36.37² =
  37. 37.58² =
  38. 38.35² =
  39. 39.64² =
  40. 40.79² =

Answer key

  1. 9801
  2. 3136
  3. 1444
  4. 4489
  5. 1024
  6. 5329
  7. 2601
  8. 4761
  9. 7225
  10. 1296
  11. 2209
  12. 3025
  13. 2401
  14. 5041
  15. 5625
  16. 1764
  17. 9216
  18. 4225
  19. 7396
  20. 5929
  21. 3969
  22. 1681
  23. 1521
  24. 7056
  25. 6561
  26. 8649
  27. 2704
  28. 4356
  29. 9604
  30. 961
  31. 6724
  32. 8836
  33. 2025
  34. 5476
  35. 3721
  36. 1369
  37. 3364
  38. 1225
  39. 4096
  40. 6241

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