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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 663 · 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. 1.72² =
  2. 2.95² =
  3. 3.43² =
  4. 4.37² =
  5. 5.34² =
  6. 6.49² =
  7. 7.46² =
  8. 8.85² =
  9. 9.38² =
  10. 10.61² =
  11. 11.59² =
  12. 12.31² =
  13. 13.73² =
  14. 14.56² =
  15. 15.96² =
  16. 16.44² =
  17. 17.62² =
  18. 18.45² =
  19. 19.83² =
  20. 20.82² =
  21. 21.47² =
  22. 22.65² =
  23. 23.35² =
  24. 24.87² =
  25. 25.41² =
  26. 26.75² =
  27. 27.68² =
  28. 28.32² =
  29. 29.55² =
  30. 30.71² =
  31. 31.89² =
  32. 32.92² =
  33. 33.78² =
  34. 34.63² =
  35. 35.91² =
  36. 36.79² =
  37. 37.42² =
  38. 38.33² =
  39. 39.64² =
  40. 40.81² =

Answer key

  1. 5184
  2. 9025
  3. 1849
  4. 1369
  5. 1156
  6. 2401
  7. 2116
  8. 7225
  9. 1444
  10. 3721
  11. 3481
  12. 961
  13. 5329
  14. 3136
  15. 9216
  16. 1936
  17. 3844
  18. 2025
  19. 6889
  20. 6724
  21. 2209
  22. 4225
  23. 1225
  24. 7569
  25. 1681
  26. 5625
  27. 4624
  28. 1024
  29. 3025
  30. 5041
  31. 7921
  32. 8464
  33. 6084
  34. 3969
  35. 8281
  36. 6241
  37. 1764
  38. 1089
  39. 4096
  40. 6561

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