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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 637 · 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. 1.38² =
  2. 2.65² =
  3. 3.52² =
  4. 4.51² =
  5. 5.61² =
  6. 6.31² =
  7. 7.36² =
  8. 8.89² =
  9. 9.39² =
  10. 10.56² =
  11. 11.64² =
  12. 12.44² =
  13. 13.87² =
  14. 14.93² =
  15. 15.75² =
  16. 16.69² =
  17. 17.71² =
  18. 18.58² =
  19. 19.96² =
  20. 20.33² =
  21. 21.99² =
  22. 22.92² =
  23. 23.34² =
  24. 24.57² =
  25. 25.46² =
  26. 26.84² =
  27. 27.83² =
  28. 28.55² =
  29. 29.47² =
  30. 30.81² =
  31. 31.78² =
  32. 32.41² =
  33. 33.37² =
  34. 34.42² =
  35. 35.82² =
  36. 36.79² =
  37. 37.59² =
  38. 38.49² =
  39. 39.73² =
  40. 40.94² =

Answer key

  1. 1444
  2. 4225
  3. 2704
  4. 2601
  5. 3721
  6. 961
  7. 1296
  8. 7921
  9. 1521
  10. 3136
  11. 4096
  12. 1936
  13. 7569
  14. 8649
  15. 5625
  16. 4761
  17. 5041
  18. 3364
  19. 9216
  20. 1089
  21. 9801
  22. 8464
  23. 1156
  24. 3249
  25. 2116
  26. 7056
  27. 6889
  28. 3025
  29. 2209
  30. 6561
  31. 6084
  32. 1681
  33. 1369
  34. 1764
  35. 6724
  36. 6241
  37. 3481
  38. 2401
  39. 5329
  40. 8836

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