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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 785 · 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. 1.54² =
  2. 2.51² =
  3. 3.71² =
  4. 4.75² =
  5. 5.43² =
  6. 6.42² =
  7. 7.58² =
  8. 8.85² =
  9. 9.46² =
  10. 10.83² =
  11. 11.53² =
  12. 12.68² =
  13. 13.65² =
  14. 14.88² =
  15. 15.36² =
  16. 16.91² =
  17. 17.82² =
  18. 18.61² =
  19. 19.94² =
  20. 20.93² =
  21. 21.48² =
  22. 22.57² =
  23. 23.41² =
  24. 24.45² =
  25. 25.99² =
  26. 26.38² =
  27. 27.34² =
  28. 28.59² =
  29. 29.78² =
  30. 30.69² =
  31. 31.47² =
  32. 32.44² =
  33. 33.98² =
  34. 34.55² =
  35. 35.35² =
  36. 36.32² =
  37. 37.95² =
  38. 38.89² =
  39. 39.31² =
  40. 40.92² =

Answer key

  1. 2916
  2. 2601
  3. 5041
  4. 5625
  5. 1849
  6. 1764
  7. 3364
  8. 7225
  9. 2116
  10. 6889
  11. 2809
  12. 4624
  13. 4225
  14. 7744
  15. 1296
  16. 8281
  17. 6724
  18. 3721
  19. 8836
  20. 8649
  21. 2304
  22. 3249
  23. 1681
  24. 2025
  25. 9801
  26. 1444
  27. 1156
  28. 3481
  29. 6084
  30. 4761
  31. 2209
  32. 1936
  33. 9604
  34. 3025
  35. 1225
  36. 1024
  37. 9025
  38. 7921
  39. 961
  40. 8464

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