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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 690 · 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. 1.34² =
  2. 2.84² =
  3. 3.39² =
  4. 4.43² =
  5. 5.61² =
  6. 6.89² =
  7. 7.47² =
  8. 8.56² =
  9. 9.36² =
  10. 10.51² =
  11. 11.97² =
  12. 12.57² =
  13. 13.63² =
  14. 14.38² =
  15. 15.92² =
  16. 16.71² =
  17. 17.35² =
  18. 18.98² =
  19. 19.99² =
  20. 20.82² =
  21. 21.65² =
  22. 22.41² =
  23. 23.73² =
  24. 24.45² =
  25. 25.32² =
  26. 26.78² =
  27. 27.88² =
  28. 28.86² =
  29. 29.91² =
  30. 30.94² =
  31. 31.33² =
  32. 32.67² =
  33. 33.81² =
  34. 34.42² =
  35. 35.74² =
  36. 36.79² =
  37. 37.31² =
  38. 38.53² =
  39. 39.59² =
  40. 40.58² =

Answer key

  1. 1156
  2. 7056
  3. 1521
  4. 1849
  5. 3721
  6. 7921
  7. 2209
  8. 3136
  9. 1296
  10. 2601
  11. 9409
  12. 3249
  13. 3969
  14. 1444
  15. 8464
  16. 5041
  17. 1225
  18. 9604
  19. 9801
  20. 6724
  21. 4225
  22. 1681
  23. 5329
  24. 2025
  25. 1024
  26. 6084
  27. 7744
  28. 7396
  29. 8281
  30. 8836
  31. 1089
  32. 4489
  33. 6561
  34. 1764
  35. 5476
  36. 6241
  37. 961
  38. 2809
  39. 3481
  40. 3364

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