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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 662 · 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. 1.41² =
  2. 2.33² =
  3. 3.89² =
  4. 4.49² =
  5. 5.91² =
  6. 6.63² =
  7. 7.43² =
  8. 8.85² =
  9. 9.38² =
  10. 10.51² =
  11. 11.66² =
  12. 12.81² =
  13. 13.64² =
  14. 14.62² =
  15. 15.39² =
  16. 16.69² =
  17. 17.44² =
  18. 18.84² =
  19. 19.76² =
  20. 20.88² =
  21. 21.47² =
  22. 22.54² =
  23. 23.82² =
  24. 24.98² =
  25. 25.79² =
  26. 26.77² =
  27. 27.97² =
  28. 28.99² =
  29. 29.86² =
  30. 30.45² =
  31. 31.73² =
  32. 32.56² =
  33. 33.32² =
  34. 34.35² =
  35. 35.78² =
  36. 36.71² =
  37. 37.61² =
  38. 38.65² =
  39. 39.46² =
  40. 40.94² =

Answer key

  1. 1681
  2. 1089
  3. 7921
  4. 2401
  5. 8281
  6. 3969
  7. 1849
  8. 7225
  9. 1444
  10. 2601
  11. 4356
  12. 6561
  13. 4096
  14. 3844
  15. 1521
  16. 4761
  17. 1936
  18. 7056
  19. 5776
  20. 7744
  21. 2209
  22. 2916
  23. 6724
  24. 9604
  25. 6241
  26. 5929
  27. 9409
  28. 9801
  29. 7396
  30. 2025
  31. 5329
  32. 3136
  33. 1024
  34. 1225
  35. 6084
  36. 5041
  37. 3721
  38. 4225
  39. 2116
  40. 8836

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