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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 861 · 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. 1.32² =
  2. 2.71² =
  3. 3.65² =
  4. 4.91² =
  5. 5.44² =
  6. 6.61² =
  7. 7.64² =
  8. 8.45² =
  9. 9.92² =
  10. 10.34² =
  11. 11.46² =
  12. 12.74² =
  13. 13.33² =
  14. 14.38² =
  15. 15.94² =
  16. 16.95² =
  17. 17.51² =
  18. 18.78² =
  19. 19.81² =
  20. 20.48² =
  21. 21.82² =
  22. 22.83² =
  23. 23.99² =
  24. 24.43² =
  25. 25.73² =
  26. 26.57² =
  27. 27.86² =
  28. 28.84² =
  29. 29.31² =
  30. 30.42² =
  31. 31.69² =
  32. 32.76² =
  33. 33.66² =
  34. 34.55² =
  35. 35.85² =
  36. 36.39² =
  37. 37.63² =
  38. 38.89² =
  39. 39.49² =
  40. 40.41² =

Answer key

  1. 1024
  2. 5041
  3. 4225
  4. 8281
  5. 1936
  6. 3721
  7. 4096
  8. 2025
  9. 8464
  10. 1156
  11. 2116
  12. 5476
  13. 1089
  14. 1444
  15. 8836
  16. 9025
  17. 2601
  18. 6084
  19. 6561
  20. 2304
  21. 6724
  22. 6889
  23. 9801
  24. 1849
  25. 5329
  26. 3249
  27. 7396
  28. 7056
  29. 961
  30. 1764
  31. 4761
  32. 5776
  33. 4356
  34. 3025
  35. 7225
  36. 1521
  37. 3969
  38. 7921
  39. 2401
  40. 1681

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