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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 142 · 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. 1.57² =
  2. 2.98² =
  3. 3.58² =
  4. 4.95² =
  5. 5.91² =
  6. 6.45² =
  7. 7.78² =
  8. 8.34² =
  9. 9.96² =
  10. 10.71² =
  11. 11.64² =
  12. 12.44² =
  13. 13.92² =
  14. 14.31² =
  15. 15.85² =
  16. 16.32² =
  17. 17.53² =
  18. 18.48² =
  19. 19.61² =
  20. 20.37² =
  21. 21.68² =
  22. 22.75² =
  23. 23.73² =
  24. 24.49² =
  25. 25.35² =
  26. 26.72² =
  27. 27.65² =
  28. 28.54² =
  29. 29.56² =
  30. 30.84² =
  31. 31.51² =
  32. 32.47² =
  33. 33.41² =
  34. 34.55² =
  35. 35.77² =
  36. 36.36² =
  37. 37.62² =
  38. 38.67² =
  39. 39.59² =
  40. 40.43² =

Answer key

  1. 3249
  2. 9604
  3. 3364
  4. 9025
  5. 8281
  6. 2025
  7. 6084
  8. 1156
  9. 9216
  10. 5041
  11. 4096
  12. 1936
  13. 8464
  14. 961
  15. 7225
  16. 1024
  17. 2809
  18. 2304
  19. 3721
  20. 1369
  21. 4624
  22. 5625
  23. 5329
  24. 2401
  25. 1225
  26. 5184
  27. 4225
  28. 2916
  29. 3136
  30. 7056
  31. 2601
  32. 2209
  33. 1681
  34. 3025
  35. 5929
  36. 1296
  37. 3844
  38. 4489
  39. 3481
  40. 1849

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