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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 581 · 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. 1.57² =
  2. 2.92² =
  3. 3.43² =
  4. 4.75² =
  5. 5.76² =
  6. 6.46² =
  7. 7.53² =
  8. 8.64² =
  9. 9.88² =
  10. 10.45² =
  11. 11.56² =
  12. 12.34² =
  13. 13.71² =
  14. 14.84² =
  15. 15.44² =
  16. 16.37² =
  17. 17.91² =
  18. 18.86² =
  19. 19.42² =
  20. 20.79² =
  21. 21.67² =
  22. 22.95² =
  23. 23.33² =
  24. 24.41² =
  25. 25.78² =
  26. 26.55² =
  27. 27.48² =
  28. 28.93² =
  29. 29.62² =
  30. 30.85² =
  31. 31.63² =
  32. 32.59² =
  33. 33.49² =
  34. 34.32² =
  35. 35.31² =
  36. 36.89² =
  37. 37.94² =
  38. 38.98² =
  39. 39.83² =
  40. 40.58² =

Answer key

  1. 3249
  2. 8464
  3. 1849
  4. 5625
  5. 5776
  6. 2116
  7. 2809
  8. 4096
  9. 7744
  10. 2025
  11. 3136
  12. 1156
  13. 5041
  14. 7056
  15. 1936
  16. 1369
  17. 8281
  18. 7396
  19. 1764
  20. 6241
  21. 4489
  22. 9025
  23. 1089
  24. 1681
  25. 6084
  26. 3025
  27. 2304
  28. 8649
  29. 3844
  30. 7225
  31. 3969
  32. 3481
  33. 2401
  34. 1024
  35. 961
  36. 7921
  37. 8836
  38. 9604
  39. 6889
  40. 3364

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