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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 708 · 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. 1.46² =
  2. 2.97² =
  3. 3.49² =
  4. 4.85² =
  5. 5.51² =
  6. 6.58² =
  7. 7.33² =
  8. 8.38² =
  9. 9.77² =
  10. 10.47² =
  11. 11.94² =
  12. 12.43² =
  13. 13.35² =
  14. 14.96² =
  15. 15.84² =
  16. 16.31² =
  17. 17.78² =
  18. 18.37² =
  19. 19.32² =
  20. 20.57² =
  21. 21.44² =
  22. 22.79² =
  23. 23.62² =
  24. 24.73² =
  25. 25.86² =
  26. 26.68² =
  27. 27.65² =
  28. 28.34² =
  29. 29.41² =
  30. 30.95² =
  31. 31.61² =
  32. 32.72² =
  33. 33.64² =
  34. 34.71² =
  35. 35.92² =
  36. 36.42² =
  37. 37.88² =
  38. 38.54² =
  39. 39.66² =
  40. 40.93² =

Answer key

  1. 2116
  2. 9409
  3. 2401
  4. 7225
  5. 2601
  6. 3364
  7. 1089
  8. 1444
  9. 5929
  10. 2209
  11. 8836
  12. 1849
  13. 1225
  14. 9216
  15. 7056
  16. 961
  17. 6084
  18. 1369
  19. 1024
  20. 3249
  21. 1936
  22. 6241
  23. 3844
  24. 5329
  25. 7396
  26. 4624
  27. 4225
  28. 1156
  29. 1681
  30. 9025
  31. 3721
  32. 5184
  33. 4096
  34. 5041
  35. 8464
  36. 1764
  37. 7744
  38. 2916
  39. 4356
  40. 8649

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