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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 929 · 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. 1.61² =
  2. 2.89² =
  3. 3.46² =
  4. 4.45² =
  5. 5.57² =
  6. 6.81² =
  7. 7.88² =
  8. 8.35² =
  9. 9.33² =
  10. 10.59² =
  11. 11.77² =
  12. 12.51² =
  13. 13.75² =
  14. 14.94² =
  15. 15.79² =
  16. 16.49² =
  17. 17.99² =
  18. 18.73² =
  19. 19.78² =
  20. 20.71² =
  21. 21.32² =
  22. 22.38² =
  23. 23.93² =
  24. 24.84² =
  25. 25.92² =
  26. 26.91² =
  27. 27.65² =
  28. 28.67² =
  29. 29.41² =
  30. 30.48² =
  31. 31.85² =
  32. 32.56² =
  33. 33.52² =
  34. 34.55² =
  35. 35.43² =
  36. 36.31² =
  37. 37.95² =
  38. 38.98² =
  39. 39.82² =
  40. 40.36² =

Answer key

  1. 3721
  2. 7921
  3. 2116
  4. 2025
  5. 3249
  6. 6561
  7. 7744
  8. 1225
  9. 1089
  10. 3481
  11. 5929
  12. 2601
  13. 5625
  14. 8836
  15. 6241
  16. 2401
  17. 9801
  18. 5329
  19. 6084
  20. 5041
  21. 1024
  22. 1444
  23. 8649
  24. 7056
  25. 8464
  26. 8281
  27. 4225
  28. 4489
  29. 1681
  30. 2304
  31. 7225
  32. 3136
  33. 2704
  34. 3025
  35. 1849
  36. 961
  37. 9025
  38. 9604
  39. 6724
  40. 1296

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