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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 934 · 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. 1.58² =
  2. 2.32² =
  3. 3.97² =
  4. 4.89² =
  5. 5.49² =
  6. 6.95² =
  7. 7.38² =
  8. 8.65² =
  9. 9.66² =
  10. 10.59² =
  11. 11.72² =
  12. 12.43² =
  13. 13.69² =
  14. 14.92² =
  15. 15.64² =
  16. 16.67² =
  17. 17.85² =
  18. 18.51² =
  19. 19.37² =
  20. 20.82² =
  21. 21.39² =
  22. 22.61² =
  23. 23.87² =
  24. 24.56² =
  25. 25.54² =
  26. 26.48² =
  27. 27.53² =
  28. 28.91² =
  29. 29.52² =
  30. 30.33² =
  31. 31.68² =
  32. 32.41² =
  33. 33.36² =
  34. 34.45² =
  35. 35.44² =
  36. 36.62² =
  37. 37.31² =
  38. 38.88² =
  39. 39.35² =
  40. 40.46² =

Answer key

  1. 3364
  2. 1024
  3. 9409
  4. 7921
  5. 2401
  6. 9025
  7. 1444
  8. 4225
  9. 4356
  10. 3481
  11. 5184
  12. 1849
  13. 4761
  14. 8464
  15. 4096
  16. 4489
  17. 7225
  18. 2601
  19. 1369
  20. 6724
  21. 1521
  22. 3721
  23. 7569
  24. 3136
  25. 2916
  26. 2304
  27. 2809
  28. 8281
  29. 2704
  30. 1089
  31. 4624
  32. 1681
  33. 1296
  34. 2025
  35. 1936
  36. 3844
  37. 961
  38. 7744
  39. 1225
  40. 2116

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