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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 847 · 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. 1.47² =
  2. 2.88² =
  3. 3.69² =
  4. 4.46² =
  5. 5.37² =
  6. 6.63² =
  7. 7.89² =
  8. 8.51² =
  9. 9.85² =
  10. 10.72² =
  11. 11.81² =
  12. 12.91² =
  13. 13.61² =
  14. 14.99² =
  15. 15.62² =
  16. 16.56² =
  17. 17.41² =
  18. 18.34² =
  19. 19.55² =
  20. 20.93² =
  21. 21.52² =
  22. 22.39² =
  23. 23.73² =
  24. 24.44² =
  25. 25.78² =
  26. 26.92² =
  27. 27.71² =
  28. 28.94² =
  29. 29.35² =
  30. 30.48² =
  31. 31.31² =
  32. 32.42² =
  33. 33.87² =
  34. 34.36² =
  35. 35.67² =
  36. 36.58² =
  37. 37.32² =
  38. 38.98² =
  39. 39.49² =
  40. 40.59² =

Answer key

  1. 2209
  2. 7744
  3. 4761
  4. 2116
  5. 1369
  6. 3969
  7. 7921
  8. 2601
  9. 7225
  10. 5184
  11. 6561
  12. 8281
  13. 3721
  14. 9801
  15. 3844
  16. 3136
  17. 1681
  18. 1156
  19. 3025
  20. 8649
  21. 2704
  22. 1521
  23. 5329
  24. 1936
  25. 6084
  26. 8464
  27. 5041
  28. 8836
  29. 1225
  30. 2304
  31. 961
  32. 1764
  33. 7569
  34. 1296
  35. 4489
  36. 3364
  37. 1024
  38. 9604
  39. 2401
  40. 3481

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