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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 907 · 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. 1.89² =
  2. 2.42² =
  3. 3.48² =
  4. 4.49² =
  5. 5.97² =
  6. 6.92² =
  7. 7.79² =
  8. 8.95² =
  9. 9.62² =
  10. 10.94² =
  11. 11.38² =
  12. 12.69² =
  13. 13.45² =
  14. 14.71² =
  15. 15.51² =
  16. 16.31² =
  17. 17.75² =
  18. 18.65² =
  19. 19.78² =
  20. 20.37² =
  21. 21.74² =
  22. 22.55² =
  23. 23.82² =
  24. 24.87² =
  25. 25.73² =
  26. 26.33² =
  27. 27.41² =
  28. 28.86² =
  29. 29.83² =
  30. 30.76² =
  31. 31.98² =
  32. 32.81² =
  33. 33.32² =
  34. 34.36² =
  35. 35.46² =
  36. 36.53² =
  37. 37.91² =
  38. 38.77² =
  39. 39.61² =
  40. 40.67² =

Answer key

  1. 7921
  2. 1764
  3. 2304
  4. 2401
  5. 9409
  6. 8464
  7. 6241
  8. 9025
  9. 3844
  10. 8836
  11. 1444
  12. 4761
  13. 2025
  14. 5041
  15. 2601
  16. 961
  17. 5625
  18. 4225
  19. 6084
  20. 1369
  21. 5476
  22. 3025
  23. 6724
  24. 7569
  25. 5329
  26. 1089
  27. 1681
  28. 7396
  29. 6889
  30. 5776
  31. 9604
  32. 6561
  33. 1024
  34. 1296
  35. 2116
  36. 2809
  37. 8281
  38. 5929
  39. 3721
  40. 4489

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