← 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 427 · 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. 1.79² =
  2. 2.65² =
  3. 3.67² =
  4. 4.61² =
  5. 5.62² =
  6. 6.85² =
  7. 7.71² =
  8. 8.87² =
  9. 9.55² =
  10. 10.75² =
  11. 11.84² =
  12. 12.42² =
  13. 13.76² =
  14. 14.64² =
  15. 15.52² =
  16. 16.44² =
  17. 17.47² =
  18. 18.98² =
  19. 19.97² =
  20. 20.38² =
  21. 21.31² =
  22. 22.81² =
  23. 23.96² =
  24. 24.94² =
  25. 25.63² =
  26. 26.36² =
  27. 27.35² =
  28. 28.91² =
  29. 29.41² =
  30. 30.43² =
  31. 31.93² =
  32. 32.69² =
  33. 33.51² =
  34. 34.46² =
  35. 35.57² =
  36. 36.86² =
  37. 37.59² =
  38. 38.78² =
  39. 39.54² =
  40. 40.32² =

Answer key

  1. 6241
  2. 4225
  3. 4489
  4. 3721
  5. 3844
  6. 7225
  7. 5041
  8. 7569
  9. 3025
  10. 5625
  11. 7056
  12. 1764
  13. 5776
  14. 4096
  15. 2704
  16. 1936
  17. 2209
  18. 9604
  19. 9409
  20. 1444
  21. 961
  22. 6561
  23. 9216
  24. 8836
  25. 3969
  26. 1296
  27. 1225
  28. 8281
  29. 1681
  30. 1849
  31. 8649
  32. 4761
  33. 2601
  34. 2116
  35. 3249
  36. 7396
  37. 3481
  38. 6084
  39. 2916
  40. 1024

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