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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 19 · 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. 2.43² =
  3. 3.51² =
  4. 4.48² =
  5. 5.64² =
  6. 6.98² =
  7. 7.93² =
  8. 8.45² =
  9. 9.59² =
  10. 10.63² =
  11. 11.46² =
  12. 12.32² =
  13. 13.38² =
  14. 14.75² =
  15. 15.41² =
  16. 16.89² =
  17. 17.61² =
  18. 18.88² =
  19. 19.91² =
  20. 20.55² =
  21. 21.79² =
  22. 22.77² =
  23. 23.39² =
  24. 24.34² =
  25. 25.53² =
  26. 26.71² =
  27. 27.72² =
  28. 28.66² =
  29. 29.96² =
  30. 30.33² =
  31. 31.95² =
  32. 32.58² =
  33. 33.56² =
  34. 34.65² =
  35. 35.62² =
  36. 36.78² =
  37. 37.42² =
  38. 38.94² =
  39. 39.35² =
  40. 40.54² =

Answer key

  1. 6561
  2. 1849
  3. 2601
  4. 2304
  5. 4096
  6. 9604
  7. 8649
  8. 2025
  9. 3481
  10. 3969
  11. 2116
  12. 1024
  13. 1444
  14. 5625
  15. 1681
  16. 7921
  17. 3721
  18. 7744
  19. 8281
  20. 3025
  21. 6241
  22. 5929
  23. 1521
  24. 1156
  25. 2809
  26. 5041
  27. 5184
  28. 4356
  29. 9216
  30. 1089
  31. 9025
  32. 3364
  33. 3136
  34. 4225
  35. 3844
  36. 6084
  37. 1764
  38. 8836
  39. 1225
  40. 2916

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