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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 730 · 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. 1.41² =
  2. 2.48² =
  3. 3.31² =
  4. 4.34² =
  5. 5.89² =
  6. 6.71² =
  7. 7.39² =
  8. 8.85² =
  9. 9.82² =
  10. 10.56² =
  11. 11.91² =
  12. 12.33² =
  13. 13.42² =
  14. 14.98² =
  15. 15.99² =
  16. 16.83² =
  17. 17.57² =
  18. 18.63² =
  19. 19.58² =
  20. 20.84² =
  21. 21.35² =
  22. 22.87² =
  23. 23.54² =
  24. 24.72² =
  25. 25.73² =
  26. 26.49² =
  27. 27.75² =
  28. 28.74² =
  29. 29.81² =
  30. 30.78² =
  31. 31.67² =
  32. 32.38² =
  33. 33.37² =
  34. 34.44² =
  35. 35.94² =
  36. 36.76² =
  37. 37.59² =
  38. 38.46² =
  39. 39.32² =
  40. 40.77² =

Answer key

  1. 1681
  2. 2304
  3. 961
  4. 1156
  5. 7921
  6. 5041
  7. 1521
  8. 7225
  9. 6724
  10. 3136
  11. 8281
  12. 1089
  13. 1764
  14. 9604
  15. 9801
  16. 6889
  17. 3249
  18. 3969
  19. 3364
  20. 7056
  21. 1225
  22. 7569
  23. 2916
  24. 5184
  25. 5329
  26. 2401
  27. 5625
  28. 5476
  29. 6561
  30. 6084
  31. 4489
  32. 1444
  33. 1369
  34. 1936
  35. 8836
  36. 5776
  37. 3481
  38. 2116
  39. 1024
  40. 5929

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