← Square any 2-digit number: up and down lesson New set →

Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 510 · 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. 1.51² =
  2. 2.34² =
  3. 3.45² =
  4. 4.79² =
  5. 5.86² =
  6. 6.74² =
  7. 7.76² =
  8. 8.66² =
  9. 9.36² =
  10. 10.53² =
  11. 11.58² =
  12. 12.92² =
  13. 13.55² =
  14. 14.49² =
  15. 15.71² =
  16. 16.94² =
  17. 17.32² =
  18. 18.46² =
  19. 19.67² =
  20. 20.96² =
  21. 21.85² =
  22. 22.33² =
  23. 23.95² =
  24. 24.81² =
  25. 25.84² =
  26. 26.42² =
  27. 27.31² =
  28. 28.69² =
  29. 29.41² =
  30. 30.93² =
  31. 31.78² =
  32. 32.54² =
  33. 33.56² =
  34. 34.59² =
  35. 35.38² =
  36. 36.88² =
  37. 37.91² =
  38. 38.44² =
  39. 39.61² =
  40. 40.73² =

Answer key

  1. 2601
  2. 1156
  3. 2025
  4. 6241
  5. 7396
  6. 5476
  7. 5776
  8. 4356
  9. 1296
  10. 2809
  11. 3364
  12. 8464
  13. 3025
  14. 2401
  15. 5041
  16. 8836
  17. 1024
  18. 2116
  19. 4489
  20. 9216
  21. 7225
  22. 1089
  23. 9025
  24. 6561
  25. 7056
  26. 1764
  27. 961
  28. 4761
  29. 1681
  30. 8649
  31. 6084
  32. 2916
  33. 3136
  34. 3481
  35. 1444
  36. 7744
  37. 8281
  38. 1936
  39. 3721
  40. 5329

Free mental maths lessons, practice and worksheets at talentjr.in/mental-maths