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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 267 · 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. 1.45² =
  2. 2.88² =
  3. 3.98² =
  4. 4.85² =
  5. 5.44² =
  6. 6.62² =
  7. 7.83² =
  8. 8.46² =
  9. 9.53² =
  10. 10.75² =
  11. 11.66² =
  12. 12.38² =
  13. 13.76² =
  14. 14.89² =
  15. 15.51² =
  16. 16.41² =
  17. 17.73² =
  18. 18.37² =
  19. 19.81² =
  20. 20.72² =
  21. 21.34² =
  22. 22.33² =
  23. 23.52² =
  24. 24.99² =
  25. 25.87² =
  26. 26.32² =
  27. 27.65² =
  28. 28.96² =
  29. 29.55² =
  30. 30.79² =
  31. 31.59² =
  32. 32.71² =
  33. 33.78² =
  34. 34.92² =
  35. 35.36² =
  36. 36.42² =
  37. 37.94² =
  38. 38.49² =
  39. 39.64² =
  40. 40.58² =

Answer key

  1. 2025
  2. 7744
  3. 9604
  4. 7225
  5. 1936
  6. 3844
  7. 6889
  8. 2116
  9. 2809
  10. 5625
  11. 4356
  12. 1444
  13. 5776
  14. 7921
  15. 2601
  16. 1681
  17. 5329
  18. 1369
  19. 6561
  20. 5184
  21. 1156
  22. 1089
  23. 2704
  24. 9801
  25. 7569
  26. 1024
  27. 4225
  28. 9216
  29. 3025
  30. 6241
  31. 3481
  32. 5041
  33. 6084
  34. 8464
  35. 1296
  36. 1764
  37. 8836
  38. 2401
  39. 4096
  40. 3364

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