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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 822 · 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. 1.84² =
  2. 2.99² =
  3. 3.73² =
  4. 4.83² =
  5. 5.32² =
  6. 6.51² =
  7. 7.42² =
  8. 8.89² =
  9. 9.61² =
  10. 10.43² =
  11. 11.56² =
  12. 12.34² =
  13. 13.72² =
  14. 14.66² =
  15. 15.62² =
  16. 16.86² =
  17. 17.71² =
  18. 18.98² =
  19. 19.47² =
  20. 20.63² =
  21. 21.45² =
  22. 22.82² =
  23. 23.68² =
  24. 24.48² =
  25. 25.75² =
  26. 26.58² =
  27. 27.88² =
  28. 28.85² =
  29. 29.94² =
  30. 30.37² =
  31. 31.65² =
  32. 32.36² =
  33. 33.49² =
  34. 34.39² =
  35. 35.64² =
  36. 36.53² =
  37. 37.78² =
  38. 38.76² =
  39. 39.92² =
  40. 40.81² =

Answer key

  1. 7056
  2. 9801
  3. 5329
  4. 6889
  5. 1024
  6. 2601
  7. 1764
  8. 7921
  9. 3721
  10. 1849
  11. 3136
  12. 1156
  13. 5184
  14. 4356
  15. 3844
  16. 7396
  17. 5041
  18. 9604
  19. 2209
  20. 3969
  21. 2025
  22. 6724
  23. 4624
  24. 2304
  25. 5625
  26. 3364
  27. 7744
  28. 7225
  29. 8836
  30. 1369
  31. 4225
  32. 1296
  33. 2401
  34. 1521
  35. 4096
  36. 2809
  37. 6084
  38. 5776
  39. 8464
  40. 6561

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