← 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 784 · 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. 1.73² =
  2. 2.69² =
  3. 3.84² =
  4. 4.81² =
  5. 5.79² =
  6. 6.96² =
  7. 7.65² =
  8. 8.41² =
  9. 9.42² =
  10. 10.67² =
  11. 11.51² =
  12. 12.61² =
  13. 13.62² =
  14. 14.83² =
  15. 15.35² =
  16. 16.53² =
  17. 17.46² =
  18. 18.38² =
  19. 19.75² =
  20. 20.39² =
  21. 21.78² =
  22. 22.68² =
  23. 23.54² =
  24. 24.44² =
  25. 25.66² =
  26. 26.95² =
  27. 27.52² =
  28. 28.88² =
  29. 29.98² =
  30. 30.33² =
  31. 31.93² =
  32. 32.86² =
  33. 33.31² =
  34. 34.32² =
  35. 35.56² =
  36. 36.85² =
  37. 37.63² =
  38. 38.37² =
  39. 39.34² =
  40. 40.82² =

Answer key

  1. 5329
  2. 4761
  3. 7056
  4. 6561
  5. 6241
  6. 9216
  7. 4225
  8. 1681
  9. 1764
  10. 4489
  11. 2601
  12. 3721
  13. 3844
  14. 6889
  15. 1225
  16. 2809
  17. 2116
  18. 1444
  19. 5625
  20. 1521
  21. 6084
  22. 4624
  23. 2916
  24. 1936
  25. 4356
  26. 9025
  27. 2704
  28. 7744
  29. 9604
  30. 1089
  31. 8649
  32. 7396
  33. 961
  34. 1024
  35. 3136
  36. 7225
  37. 3969
  38. 1369
  39. 1156
  40. 6724

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