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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 486 · 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. 1.49² =
  2. 2.45² =
  3. 3.96² =
  4. 4.76² =
  5. 5.61² =
  6. 6.63² =
  7. 7.55² =
  8. 8.46² =
  9. 9.71² =
  10. 10.79² =
  11. 11.78² =
  12. 12.65² =
  13. 13.86² =
  14. 14.95² =
  15. 15.84² =
  16. 16.91² =
  17. 17.59² =
  18. 18.74² =
  19. 19.39² =
  20. 20.58² =
  21. 21.43² =
  22. 22.66² =
  23. 23.38² =
  24. 24.73² =
  25. 25.32² =
  26. 26.54² =
  27. 27.81² =
  28. 28.93² =
  29. 29.37² =
  30. 30.42² =
  31. 31.69² =
  32. 32.72² =
  33. 33.36² =
  34. 34.99² =
  35. 35.67² =
  36. 36.35² =
  37. 37.85² =
  38. 38.34² =
  39. 39.87² =
  40. 40.62² =

Answer key

  1. 2401
  2. 2025
  3. 9216
  4. 5776
  5. 3721
  6. 3969
  7. 3025
  8. 2116
  9. 5041
  10. 6241
  11. 6084
  12. 4225
  13. 7396
  14. 9025
  15. 7056
  16. 8281
  17. 3481
  18. 5476
  19. 1521
  20. 3364
  21. 1849
  22. 4356
  23. 1444
  24. 5329
  25. 1024
  26. 2916
  27. 6561
  28. 8649
  29. 1369
  30. 1764
  31. 4761
  32. 5184
  33. 1296
  34. 9801
  35. 4489
  36. 1225
  37. 7225
  38. 1156
  39. 7569
  40. 3844

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