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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 938 · 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. 1.56² =
  2. 2.81² =
  3. 3.67² =
  4. 4.54² =
  5. 5.37² =
  6. 6.48² =
  7. 7.46² =
  8. 8.31² =
  9. 9.47² =
  10. 10.51² =
  11. 11.35² =
  12. 12.72² =
  13. 13.41² =
  14. 14.93² =
  15. 15.44² =
  16. 16.33² =
  17. 17.36² =
  18. 18.42² =
  19. 19.32² =
  20. 20.71² =
  21. 21.49² =
  22. 22.78² =
  23. 23.94² =
  24. 24.39² =
  25. 25.97² =
  26. 26.65² =
  27. 27.98² =
  28. 28.61² =
  29. 29.84² =
  30. 30.38² =
  31. 31.75² =
  32. 32.79² =
  33. 33.53² =
  34. 34.58² =
  35. 35.96² =
  36. 36.83² =
  37. 37.87² =
  38. 38.43² =
  39. 39.73² =
  40. 40.74² =

Answer key

  1. 3136
  2. 6561
  3. 4489
  4. 2916
  5. 1369
  6. 2304
  7. 2116
  8. 961
  9. 2209
  10. 2601
  11. 1225
  12. 5184
  13. 1681
  14. 8649
  15. 1936
  16. 1089
  17. 1296
  18. 1764
  19. 1024
  20. 5041
  21. 2401
  22. 6084
  23. 8836
  24. 1521
  25. 9409
  26. 4225
  27. 9604
  28. 3721
  29. 7056
  30. 1444
  31. 5625
  32. 6241
  33. 2809
  34. 3364
  35. 9216
  36. 6889
  37. 7569
  38. 1849
  39. 5329
  40. 5476

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