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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 297 · 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. 1.77² =
  2. 2.41² =
  3. 3.58² =
  4. 4.74² =
  5. 5.73² =
  6. 6.67² =
  7. 7.35² =
  8. 8.33² =
  9. 9.71² =
  10. 10.45² =
  11. 11.75² =
  12. 12.83² =
  13. 13.62² =
  14. 14.92² =
  15. 15.53² =
  16. 16.61² =
  17. 17.54² =
  18. 18.84² =
  19. 19.32² =
  20. 20.68² =
  21. 21.97² =
  22. 22.81² =
  23. 23.48² =
  24. 24.85² =
  25. 25.56² =
  26. 26.76² =
  27. 27.63² =
  28. 28.34² =
  29. 29.88² =
  30. 30.99² =
  31. 31.43² =
  32. 32.69² =
  33. 33.51² =
  34. 34.46² =
  35. 35.37² =
  36. 36.66² =
  37. 37.38² =
  38. 38.72² =
  39. 39.42² =
  40. 40.65² =

Answer key

  1. 5929
  2. 1681
  3. 3364
  4. 5476
  5. 5329
  6. 4489
  7. 1225
  8. 1089
  9. 5041
  10. 2025
  11. 5625
  12. 6889
  13. 3844
  14. 8464
  15. 2809
  16. 3721
  17. 2916
  18. 7056
  19. 1024
  20. 4624
  21. 9409
  22. 6561
  23. 2304
  24. 7225
  25. 3136
  26. 5776
  27. 3969
  28. 1156
  29. 7744
  30. 9801
  31. 1849
  32. 4761
  33. 2601
  34. 2116
  35. 1369
  36. 4356
  37. 1444
  38. 5184
  39. 1764
  40. 4225

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