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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 863 · 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. 1.42² =
  2. 2.55² =
  3. 3.54² =
  4. 4.49² =
  5. 5.99² =
  6. 6.67² =
  7. 7.44² =
  8. 8.89² =
  9. 9.91² =
  10. 10.36² =
  11. 11.51² =
  12. 12.52² =
  13. 13.64² =
  14. 14.41² =
  15. 15.78² =
  16. 16.87² =
  17. 17.85² =
  18. 18.73² =
  19. 19.37² =
  20. 20.71² =
  21. 21.61² =
  22. 22.83² =
  23. 23.81² =
  24. 24.56² =
  25. 25.45² =
  26. 26.66² =
  27. 27.38² =
  28. 28.63² =
  29. 29.33² =
  30. 30.48² =
  31. 31.34² =
  32. 32.86² =
  33. 33.75² =
  34. 34.35² =
  35. 35.79² =
  36. 36.39² =
  37. 37.46² =
  38. 38.84² =
  39. 39.77² =
  40. 40.32² =

Answer key

  1. 1764
  2. 3025
  3. 2916
  4. 2401
  5. 9801
  6. 4489
  7. 1936
  8. 7921
  9. 8281
  10. 1296
  11. 2601
  12. 2704
  13. 4096
  14. 1681
  15. 6084
  16. 7569
  17. 7225
  18. 5329
  19. 1369
  20. 5041
  21. 3721
  22. 6889
  23. 6561
  24. 3136
  25. 2025
  26. 4356
  27. 1444
  28. 3969
  29. 1089
  30. 2304
  31. 1156
  32. 7396
  33. 5625
  34. 1225
  35. 6241
  36. 1521
  37. 2116
  38. 7056
  39. 5929
  40. 1024

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