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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 923 · 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. 1.69² =
  2. 2.62² =
  3. 3.42² =
  4. 4.78² =
  5. 5.48² =
  6. 6.61² =
  7. 7.74² =
  8. 8.51² =
  9. 9.98² =
  10. 10.85² =
  11. 11.76² =
  12. 12.71² =
  13. 13.36² =
  14. 14.93² =
  15. 15.46² =
  16. 16.33² =
  17. 17.44² =
  18. 18.73² =
  19. 19.91² =
  20. 20.65² =
  21. 21.68² =
  22. 22.96² =
  23. 23.79² =
  24. 24.75² =
  25. 25.43² =
  26. 26.49² =
  27. 27.41² =
  28. 28.94² =
  29. 29.64² =
  30. 30.31² =
  31. 31.67² =
  32. 32.97² =
  33. 33.87² =
  34. 34.53² =
  35. 35.55² =
  36. 36.47² =
  37. 37.89² =
  38. 38.54² =
  39. 39.67² =
  40. 40.58² =

Answer key

  1. 4761
  2. 3844
  3. 1764
  4. 6084
  5. 2304
  6. 3721
  7. 5476
  8. 2601
  9. 9604
  10. 7225
  11. 5776
  12. 5041
  13. 1296
  14. 8649
  15. 2116
  16. 1089
  17. 1936
  18. 5329
  19. 8281
  20. 4225
  21. 4624
  22. 9216
  23. 6241
  24. 5625
  25. 1849
  26. 2401
  27. 1681
  28. 8836
  29. 4096
  30. 961
  31. 4489
  32. 9409
  33. 7569
  34. 2809
  35. 3025
  36. 2209
  37. 7921
  38. 2916
  39. 4489
  40. 3364

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