← 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 347 · 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. 1.89² =
  2. 2.62² =
  3. 3.65² =
  4. 4.95² =
  5. 5.66² =
  6. 6.36² =
  7. 7.67² =
  8. 8.96² =
  9. 9.48² =
  10. 10.98² =
  11. 11.82² =
  12. 12.75² =
  13. 13.73² =
  14. 14.54² =
  15. 15.93² =
  16. 16.35² =
  17. 17.38² =
  18. 18.71² =
  19. 19.87² =
  20. 20.41² =
  21. 21.45² =
  22. 22.92² =
  23. 23.32² =
  24. 24.63² =
  25. 25.44² =
  26. 26.33² =
  27. 27.61² =
  28. 28.51² =
  29. 29.37² =
  30. 30.78² =
  31. 31.56² =
  32. 32.97² =
  33. 33.76² =
  34. 34.94² =
  35. 35.81² =
  36. 36.39² =
  37. 37.49² =
  38. 38.91² =
  39. 39.52² =
  40. 40.42² =

Answer key

  1. 7921
  2. 3844
  3. 4225
  4. 9025
  5. 4356
  6. 1296
  7. 4489
  8. 9216
  9. 2304
  10. 9604
  11. 6724
  12. 5625
  13. 5329
  14. 2916
  15. 8649
  16. 1225
  17. 1444
  18. 5041
  19. 7569
  20. 1681
  21. 2025
  22. 8464
  23. 1024
  24. 3969
  25. 1936
  26. 1089
  27. 3721
  28. 2601
  29. 1369
  30. 6084
  31. 3136
  32. 9409
  33. 5776
  34. 8836
  35. 6561
  36. 1521
  37. 2401
  38. 8281
  39. 2704
  40. 1764

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