← 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 548 · 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. 2.44² =
  3. 3.87² =
  4. 4.66² =
  5. 5.91² =
  6. 6.31² =
  7. 7.64² =
  8. 8.95² =
  9. 9.32² =
  10. 10.35² =
  11. 11.47² =
  12. 12.59² =
  13. 13.71² =
  14. 14.62² =
  15. 15.34² =
  16. 16.89² =
  17. 17.73² =
  18. 18.75² =
  19. 19.41² =
  20. 20.88² =
  21. 21.98² =
  22. 22.85² =
  23. 23.65² =
  24. 24.61² =
  25. 25.83² =
  26. 26.52² =
  27. 27.86² =
  28. 28.97² =
  29. 29.72² =
  30. 30.38² =
  31. 31.63² =
  32. 32.79² =
  33. 33.96² =
  34. 34.33² =
  35. 35.45² =
  36. 36.94² =
  37. 37.46² =
  38. 38.37² =
  39. 39.42² =
  40. 40.43² =

Answer key

  1. 2601
  2. 1936
  3. 7569
  4. 4356
  5. 8281
  6. 961
  7. 4096
  8. 9025
  9. 1024
  10. 1225
  11. 2209
  12. 3481
  13. 5041
  14. 3844
  15. 1156
  16. 7921
  17. 5329
  18. 5625
  19. 1681
  20. 7744
  21. 9604
  22. 7225
  23. 4225
  24. 3721
  25. 6889
  26. 2704
  27. 7396
  28. 9409
  29. 5184
  30. 1444
  31. 3969
  32. 6241
  33. 9216
  34. 1089
  35. 2025
  36. 8836
  37. 2116
  38. 1369
  39. 1764
  40. 1849

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