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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 508 · 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. 1.33² =
  2. 2.69² =
  3. 3.41² =
  4. 4.73² =
  5. 5.51² =
  6. 6.57² =
  7. 7.72² =
  8. 8.53² =
  9. 9.62² =
  10. 10.81² =
  11. 11.32² =
  12. 12.63² =
  13. 13.45² =
  14. 14.96² =
  15. 15.83² =
  16. 16.92² =
  17. 17.43² =
  18. 18.71² =
  19. 19.36² =
  20. 20.54² =
  21. 21.94² =
  22. 22.84² =
  23. 23.46² =
  24. 24.76² =
  25. 25.77² =
  26. 26.64² =
  27. 27.99² =
  28. 28.85² =
  29. 29.48² =
  30. 30.93² =
  31. 31.35² =
  32. 32.61² =
  33. 33.38² =
  34. 34.98² =
  35. 35.37² =
  36. 36.86² =
  37. 37.67² =
  38. 38.97² =
  39. 39.66² =
  40. 40.65² =

Answer key

  1. 1089
  2. 4761
  3. 1681
  4. 5329
  5. 2601
  6. 3249
  7. 5184
  8. 2809
  9. 3844
  10. 6561
  11. 1024
  12. 3969
  13. 2025
  14. 9216
  15. 6889
  16. 8464
  17. 1849
  18. 5041
  19. 1296
  20. 2916
  21. 8836
  22. 7056
  23. 2116
  24. 5776
  25. 5929
  26. 4096
  27. 9801
  28. 7225
  29. 2304
  30. 8649
  31. 1225
  32. 3721
  33. 1444
  34. 9604
  35. 1369
  36. 7396
  37. 4489
  38. 9409
  39. 4356
  40. 4225

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