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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 978 · 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. 1.84² =
  2. 2.63² =
  3. 3.73² =
  4. 4.98² =
  5. 5.33² =
  6. 6.36² =
  7. 7.86² =
  8. 8.91² =
  9. 9.47² =
  10. 10.95² =
  11. 11.83² =
  12. 12.92² =
  13. 13.79² =
  14. 14.93² =
  15. 15.96² =
  16. 16.66² =
  17. 17.72² =
  18. 18.82² =
  19. 19.94² =
  20. 20.64² =
  21. 21.56² =
  22. 22.76² =
  23. 23.34² =
  24. 24.99² =
  25. 25.61² =
  26. 26.37² =
  27. 27.31² =
  28. 28.67² =
  29. 29.58² =
  30. 30.38² =
  31. 31.78² =
  32. 32.53² =
  33. 33.68² =
  34. 34.85² =
  35. 35.39² =
  36. 36.77² =
  37. 37.46² =
  38. 38.42² =
  39. 39.59² =
  40. 40.43² =

Answer key

  1. 7056
  2. 3969
  3. 5329
  4. 9604
  5. 1089
  6. 1296
  7. 7396
  8. 8281
  9. 2209
  10. 9025
  11. 6889
  12. 8464
  13. 6241
  14. 8649
  15. 9216
  16. 4356
  17. 5184
  18. 6724
  19. 8836
  20. 4096
  21. 3136
  22. 5776
  23. 1156
  24. 9801
  25. 3721
  26. 1369
  27. 961
  28. 4489
  29. 3364
  30. 1444
  31. 6084
  32. 2809
  33. 4624
  34. 7225
  35. 1521
  36. 5929
  37. 2116
  38. 1764
  39. 3481
  40. 1849

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