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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 809 · 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. 1.49² =
  2. 2.57² =
  3. 3.38² =
  4. 4.32² =
  5. 5.66² =
  6. 6.77² =
  7. 7.88² =
  8. 8.94² =
  9. 9.56² =
  10. 10.64² =
  11. 11.39² =
  12. 12.58² =
  13. 13.35² =
  14. 14.76² =
  15. 15.74² =
  16. 16.72² =
  17. 17.42² =
  18. 18.98² =
  19. 19.52² =
  20. 20.34² =
  21. 21.78² =
  22. 22.37² =
  23. 23.86² =
  24. 24.51² =
  25. 25.31² =
  26. 26.73² =
  27. 27.69² =
  28. 28.41² =
  29. 29.44² =
  30. 30.63² =
  31. 31.83² =
  32. 32.62² =
  33. 33.91² =
  34. 34.61² =
  35. 35.71² =
  36. 36.93² =
  37. 37.85² =
  38. 38.48² =
  39. 39.46² =
  40. 40.75² =

Answer key

  1. 2401
  2. 3249
  3. 1444
  4. 1024
  5. 4356
  6. 5929
  7. 7744
  8. 8836
  9. 3136
  10. 4096
  11. 1521
  12. 3364
  13. 1225
  14. 5776
  15. 5476
  16. 5184
  17. 1764
  18. 9604
  19. 2704
  20. 1156
  21. 6084
  22. 1369
  23. 7396
  24. 2601
  25. 961
  26. 5329
  27. 4761
  28. 1681
  29. 1936
  30. 3969
  31. 6889
  32. 3844
  33. 8281
  34. 3721
  35. 5041
  36. 8649
  37. 7225
  38. 2304
  39. 2116
  40. 5625

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