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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 479 · 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. 1.45² =
  2. 2.43² =
  3. 3.99² =
  4. 4.86² =
  5. 5.71² =
  6. 6.92² =
  7. 7.72² =
  8. 8.39² =
  9. 9.44² =
  10. 10.77² =
  11. 11.65² =
  12. 12.52² =
  13. 13.83² =
  14. 14.81² =
  15. 15.33² =
  16. 16.91² =
  17. 17.38² =
  18. 18.59² =
  19. 19.75² =
  20. 20.51² =
  21. 21.85² =
  22. 22.94² =
  23. 23.62² =
  24. 24.98² =
  25. 25.97² =
  26. 26.41² =
  27. 27.32² =
  28. 28.76² =
  29. 29.61² =
  30. 30.56² =
  31. 31.54² =
  32. 32.63² =
  33. 33.96² =
  34. 34.89² =
  35. 35.84² =
  36. 36.66² =
  37. 37.69² =
  38. 38.35² =
  39. 39.79² =
  40. 40.53² =

Answer key

  1. 2025
  2. 1849
  3. 9801
  4. 7396
  5. 5041
  6. 8464
  7. 5184
  8. 1521
  9. 1936
  10. 5929
  11. 4225
  12. 2704
  13. 6889
  14. 6561
  15. 1089
  16. 8281
  17. 1444
  18. 3481
  19. 5625
  20. 2601
  21. 7225
  22. 8836
  23. 3844
  24. 9604
  25. 9409
  26. 1681
  27. 1024
  28. 5776
  29. 3721
  30. 3136
  31. 2916
  32. 3969
  33. 9216
  34. 7921
  35. 7056
  36. 4356
  37. 4761
  38. 1225
  39. 6241
  40. 2809

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