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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 516 · 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. 1.37² =
  2. 2.45² =
  3. 3.41² =
  4. 4.55² =
  5. 5.78² =
  6. 6.71² =
  7. 7.35² =
  8. 8.64² =
  9. 9.46² =
  10. 10.51² =
  11. 11.59² =
  12. 12.56² =
  13. 13.82² =
  14. 14.65² =
  15. 15.88² =
  16. 16.81² =
  17. 17.85² =
  18. 18.92² =
  19. 19.42² =
  20. 20.52² =
  21. 21.83² =
  22. 22.96² =
  23. 23.72² =
  24. 24.94² =
  25. 25.49² =
  26. 26.73² =
  27. 27.87² =
  28. 28.79² =
  29. 29.48² =
  30. 30.38² =
  31. 31.63² =
  32. 32.95² =
  33. 33.58² =
  34. 34.34² =
  35. 35.31² =
  36. 36.43² =
  37. 37.84² =
  38. 38.76² =
  39. 39.77² =
  40. 40.61² =

Answer key

  1. 1369
  2. 2025
  3. 1681
  4. 3025
  5. 6084
  6. 5041
  7. 1225
  8. 4096
  9. 2116
  10. 2601
  11. 3481
  12. 3136
  13. 6724
  14. 4225
  15. 7744
  16. 6561
  17. 7225
  18. 8464
  19. 1764
  20. 2704
  21. 6889
  22. 9216
  23. 5184
  24. 8836
  25. 2401
  26. 5329
  27. 7569
  28. 6241
  29. 2304
  30. 1444
  31. 3969
  32. 9025
  33. 3364
  34. 1156
  35. 961
  36. 1849
  37. 7056
  38. 5776
  39. 5929
  40. 3721

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