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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 339 · 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. 2.34² =
  3. 3.54² =
  4. 4.99² =
  5. 5.95² =
  6. 6.85² =
  7. 7.94² =
  8. 8.38² =
  9. 9.41² =
  10. 10.91² =
  11. 11.57² =
  12. 12.82² =
  13. 13.45² =
  14. 14.51² =
  15. 15.78² =
  16. 16.92² =
  17. 17.96² =
  18. 18.79² =
  19. 19.59² =
  20. 20.33² =
  21. 21.44² =
  22. 22.65² =
  23. 23.55² =
  24. 24.48² =
  25. 25.83² =
  26. 26.84² =
  27. 27.71² =
  28. 28.46² =
  29. 29.56² =
  30. 30.68² =
  31. 31.81² =
  32. 32.42² =
  33. 33.87² =
  34. 34.64² =
  35. 35.37² =
  36. 36.93² =
  37. 37.62² =
  38. 38.73² =
  39. 39.98² =
  40. 40.61² =

Answer key

  1. 7744
  2. 1156
  3. 2916
  4. 9801
  5. 9025
  6. 7225
  7. 8836
  8. 1444
  9. 1681
  10. 8281
  11. 3249
  12. 6724
  13. 2025
  14. 2601
  15. 6084
  16. 8464
  17. 9216
  18. 6241
  19. 3481
  20. 1089
  21. 1936
  22. 4225
  23. 3025
  24. 2304
  25. 6889
  26. 7056
  27. 5041
  28. 2116
  29. 3136
  30. 4624
  31. 6561
  32. 1764
  33. 7569
  34. 4096
  35. 1369
  36. 8649
  37. 3844
  38. 5329
  39. 9604
  40. 3721

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