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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 293 · 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. 1.81² =
  2. 2.51² =
  3. 3.35² =
  4. 4.53² =
  5. 5.45² =
  6. 6.68² =
  7. 7.55² =
  8. 8.38² =
  9. 9.93² =
  10. 10.56² =
  11. 11.94² =
  12. 12.59² =
  13. 13.41² =
  14. 14.31² =
  15. 15.88² =
  16. 16.39² =
  17. 17.32² =
  18. 18.62² =
  19. 19.92² =
  20. 20.99² =
  21. 21.48² =
  22. 22.58² =
  23. 23.66² =
  24. 24.89² =
  25. 25.77² =
  26. 26.63² =
  27. 27.91² =
  28. 28.78² =
  29. 29.43² =
  30. 30.46² =
  31. 31.79² =
  32. 32.82² =
  33. 33.42² =
  34. 34.33² =
  35. 35.76² =
  36. 36.71² =
  37. 37.52² =
  38. 38.84² =
  39. 39.61² =
  40. 40.54² =

Answer key

  1. 6561
  2. 2601
  3. 1225
  4. 2809
  5. 2025
  6. 4624
  7. 3025
  8. 1444
  9. 8649
  10. 3136
  11. 8836
  12. 3481
  13. 1681
  14. 961
  15. 7744
  16. 1521
  17. 1024
  18. 3844
  19. 8464
  20. 9801
  21. 2304
  22. 3364
  23. 4356
  24. 7921
  25. 5929
  26. 3969
  27. 8281
  28. 6084
  29. 1849
  30. 2116
  31. 6241
  32. 6724
  33. 1764
  34. 1089
  35. 5776
  36. 5041
  37. 2704
  38. 7056
  39. 3721
  40. 2916

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