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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 373 · 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. 1.73² =
  2. 2.35² =
  3. 3.38² =
  4. 4.48² =
  5. 5.83² =
  6. 6.72² =
  7. 7.99² =
  8. 8.47² =
  9. 9.78² =
  10. 10.88² =
  11. 11.69² =
  12. 12.51² =
  13. 13.87² =
  14. 14.71² =
  15. 15.41² =
  16. 16.86² =
  17. 17.76² =
  18. 18.91² =
  19. 19.44² =
  20. 20.95² =
  21. 21.31² =
  22. 22.37² =
  23. 23.46² =
  24. 24.42² =
  25. 25.63² =
  26. 26.32² =
  27. 27.84² =
  28. 28.74² =
  29. 29.98² =
  30. 30.62² =
  31. 31.53² =
  32. 32.54² =
  33. 33.81² =
  34. 34.61² =
  35. 35.94² =
  36. 36.43² =
  37. 37.49² =
  38. 38.93² =
  39. 39.96² =
  40. 40.33² =

Answer key

  1. 5329
  2. 1225
  3. 1444
  4. 2304
  5. 6889
  6. 5184
  7. 9801
  8. 2209
  9. 6084
  10. 7744
  11. 4761
  12. 2601
  13. 7569
  14. 5041
  15. 1681
  16. 7396
  17. 5776
  18. 8281
  19. 1936
  20. 9025
  21. 961
  22. 1369
  23. 2116
  24. 1764
  25. 3969
  26. 1024
  27. 7056
  28. 5476
  29. 9604
  30. 3844
  31. 2809
  32. 2916
  33. 6561
  34. 3721
  35. 8836
  36. 1849
  37. 2401
  38. 8649
  39. 9216
  40. 1089

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