← 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 879 · 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. 1.32² =
  2. 2.47² =
  3. 3.51² =
  4. 4.44² =
  5. 5.91² =
  6. 6.73² =
  7. 7.58² =
  8. 8.79² =
  9. 9.82² =
  10. 10.68² =
  11. 11.63² =
  12. 12.89² =
  13. 13.39² =
  14. 14.93² =
  15. 15.36² =
  16. 16.55² =
  17. 17.49² =
  18. 18.97² =
  19. 19.62² =
  20. 20.41² =
  21. 21.88² =
  22. 22.69² =
  23. 23.81² =
  24. 24.96² =
  25. 25.67² =
  26. 26.87² =
  27. 27.74² =
  28. 28.38² =
  29. 29.66² =
  30. 30.34² =
  31. 31.76² =
  32. 32.46² =
  33. 33.59² =
  34. 34.83² =
  35. 35.52² =
  36. 36.45² =
  37. 37.84² =
  38. 38.43² =
  39. 39.72² =
  40. 40.31² =

Answer key

  1. 1024
  2. 2209
  3. 2601
  4. 1936
  5. 8281
  6. 5329
  7. 3364
  8. 6241
  9. 6724
  10. 4624
  11. 3969
  12. 7921
  13. 1521
  14. 8649
  15. 1296
  16. 3025
  17. 2401
  18. 9409
  19. 3844
  20. 1681
  21. 7744
  22. 4761
  23. 6561
  24. 9216
  25. 4489
  26. 7569
  27. 5476
  28. 1444
  29. 4356
  30. 1156
  31. 5776
  32. 2116
  33. 3481
  34. 6889
  35. 2704
  36. 2025
  37. 7056
  38. 1849
  39. 5184
  40. 961

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