← 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 518 · 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. 1.44² =
  2. 2.41² =
  3. 3.54² =
  4. 4.37² =
  5. 5.55² =
  6. 6.94² =
  7. 7.62² =
  8. 8.71² =
  9. 9.78² =
  10. 10.61² =
  11. 11.46² =
  12. 12.93² =
  13. 13.84² =
  14. 14.91² =
  15. 15.39² =
  16. 16.43² =
  17. 17.68² =
  18. 18.47² =
  19. 19.52² =
  20. 20.36² =
  21. 21.97² =
  22. 22.81² =
  23. 23.67² =
  24. 24.99² =
  25. 25.34² =
  26. 26.88² =
  27. 27.75² =
  28. 28.33² =
  29. 29.59² =
  30. 30.31² =
  31. 31.63² =
  32. 32.49² =
  33. 33.32² =
  34. 34.66² =
  35. 35.69² =
  36. 36.73² =
  37. 37.51² =
  38. 38.98² =
  39. 39.79² =
  40. 40.53² =

Answer key

  1. 1936
  2. 1681
  3. 2916
  4. 1369
  5. 3025
  6. 8836
  7. 3844
  8. 5041
  9. 6084
  10. 3721
  11. 2116
  12. 8649
  13. 7056
  14. 8281
  15. 1521
  16. 1849
  17. 4624
  18. 2209
  19. 2704
  20. 1296
  21. 9409
  22. 6561
  23. 4489
  24. 9801
  25. 1156
  26. 7744
  27. 5625
  28. 1089
  29. 3481
  30. 961
  31. 3969
  32. 2401
  33. 1024
  34. 4356
  35. 4761
  36. 5329
  37. 2601
  38. 9604
  39. 6241
  40. 2809

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