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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 869 · 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. 1.95² =
  2. 2.41² =
  3. 3.54² =
  4. 4.89² =
  5. 5.43² =
  6. 6.56² =
  7. 7.69² =
  8. 8.99² =
  9. 9.74² =
  10. 10.71² =
  11. 11.35² =
  12. 12.46² =
  13. 13.72² =
  14. 14.36² =
  15. 15.58² =
  16. 16.91² =
  17. 17.73² =
  18. 18.68² =
  19. 19.98² =
  20. 20.81² =
  21. 21.57² =
  22. 22.84² =
  23. 23.39² =
  24. 24.88² =
  25. 25.62² =
  26. 26.96² =
  27. 27.79² =
  28. 28.34² =
  29. 29.33² =
  30. 30.78² =
  31. 31.31² =
  32. 32.48² =
  33. 33.32² =
  34. 34.93² =
  35. 35.44² =
  36. 36.51² =
  37. 37.65² =
  38. 38.59² =
  39. 39.38² =
  40. 40.77² =

Answer key

  1. 9025
  2. 1681
  3. 2916
  4. 7921
  5. 1849
  6. 3136
  7. 4761
  8. 9801
  9. 5476
  10. 5041
  11. 1225
  12. 2116
  13. 5184
  14. 1296
  15. 3364
  16. 8281
  17. 5329
  18. 4624
  19. 9604
  20. 6561
  21. 3249
  22. 7056
  23. 1521
  24. 7744
  25. 3844
  26. 9216
  27. 6241
  28. 1156
  29. 1089
  30. 6084
  31. 961
  32. 2304
  33. 1024
  34. 8649
  35. 1936
  36. 2601
  37. 4225
  38. 3481
  39. 1444
  40. 5929

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