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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 920 · 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. 1.51² =
  2. 2.99² =
  3. 3.82² =
  4. 4.94² =
  5. 5.35² =
  6. 6.36² =
  7. 7.52² =
  8. 8.37² =
  9. 9.44² =
  10. 10.31² =
  11. 11.61² =
  12. 12.46² =
  13. 13.56² =
  14. 14.71² =
  15. 15.55² =
  16. 16.91² =
  17. 17.69² =
  18. 18.48² =
  19. 19.75² =
  20. 20.42² =
  21. 21.41² =
  22. 22.78² =
  23. 23.87² =
  24. 24.32² =
  25. 25.58² =
  26. 26.53² =
  27. 27.47² =
  28. 28.73² =
  29. 29.81² =
  30. 30.54² =
  31. 31.45² =
  32. 32.72² =
  33. 33.85² =
  34. 34.57² =
  35. 35.65² =
  36. 36.64² =
  37. 37.68² =
  38. 38.89² =
  39. 39.98² =
  40. 40.97² =

Answer key

  1. 2601
  2. 9801
  3. 6724
  4. 8836
  5. 1225
  6. 1296
  7. 2704
  8. 1369
  9. 1936
  10. 961
  11. 3721
  12. 2116
  13. 3136
  14. 5041
  15. 3025
  16. 8281
  17. 4761
  18. 2304
  19. 5625
  20. 1764
  21. 1681
  22. 6084
  23. 7569
  24. 1024
  25. 3364
  26. 2809
  27. 2209
  28. 5329
  29. 6561
  30. 2916
  31. 2025
  32. 5184
  33. 7225
  34. 3249
  35. 4225
  36. 4096
  37. 4624
  38. 7921
  39. 9604
  40. 9409

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