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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 576 · 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. 1.88² =
  2. 2.93² =
  3. 3.91² =
  4. 4.96² =
  5. 5.58² =
  6. 6.42² =
  7. 7.32² =
  8. 8.83² =
  9. 9.71² =
  10. 10.38² =
  11. 11.52² =
  12. 12.92² =
  13. 13.72² =
  14. 14.99² =
  15. 15.39² =
  16. 16.45² =
  17. 17.86² =
  18. 18.35² =
  19. 19.34² =
  20. 20.78² =
  21. 21.82² =
  22. 22.67² =
  23. 23.41² =
  24. 24.62² =
  25. 25.37² =
  26. 26.31² =
  27. 27.89² =
  28. 28.57² =
  29. 29.43² =
  30. 30.51² =
  31. 31.63² =
  32. 32.33² =
  33. 33.61² =
  34. 34.94² =
  35. 35.85² =
  36. 36.46² =
  37. 37.59² =
  38. 38.49² =
  39. 39.98² =
  40. 40.81² =

Answer key

  1. 7744
  2. 8649
  3. 8281
  4. 9216
  5. 3364
  6. 1764
  7. 1024
  8. 6889
  9. 5041
  10. 1444
  11. 2704
  12. 8464
  13. 5184
  14. 9801
  15. 1521
  16. 2025
  17. 7396
  18. 1225
  19. 1156
  20. 6084
  21. 6724
  22. 4489
  23. 1681
  24. 3844
  25. 1369
  26. 961
  27. 7921
  28. 3249
  29. 1849
  30. 2601
  31. 3969
  32. 1089
  33. 3721
  34. 8836
  35. 7225
  36. 2116
  37. 3481
  38. 2401
  39. 9604
  40. 6561

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