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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 481 · 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. 1.62² =
  2. 2.76² =
  3. 3.94² =
  4. 4.96² =
  5. 5.85² =
  6. 6.71² =
  7. 7.51² =
  8. 8.93² =
  9. 9.83² =
  10. 10.79² =
  11. 11.69² =
  12. 12.63² =
  13. 13.78² =
  14. 14.82² =
  15. 15.43² =
  16. 16.66² =
  17. 17.34² =
  18. 18.35² =
  19. 19.38² =
  20. 20.37² =
  21. 21.44² =
  22. 22.31² =
  23. 23.81² =
  24. 24.61² =
  25. 25.39² =
  26. 26.64² =
  27. 27.84² =
  28. 28.56² =
  29. 29.52² =
  30. 30.65² =
  31. 31.58² =
  32. 32.53² =
  33. 33.88² =
  34. 34.92² =
  35. 35.41² =
  36. 36.91² =
  37. 37.55² =
  38. 38.47² =
  39. 39.73² =
  40. 40.36² =

Answer key

  1. 3844
  2. 5776
  3. 8836
  4. 9216
  5. 7225
  6. 5041
  7. 2601
  8. 8649
  9. 6889
  10. 6241
  11. 4761
  12. 3969
  13. 6084
  14. 6724
  15. 1849
  16. 4356
  17. 1156
  18. 1225
  19. 1444
  20. 1369
  21. 1936
  22. 961
  23. 6561
  24. 3721
  25. 1521
  26. 4096
  27. 7056
  28. 3136
  29. 2704
  30. 4225
  31. 3364
  32. 2809
  33. 7744
  34. 8464
  35. 1681
  36. 8281
  37. 3025
  38. 2209
  39. 5329
  40. 1296

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