← 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 875 · 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. 1.43² =
  2. 2.56² =
  3. 3.33² =
  4. 4.77² =
  5. 5.63² =
  6. 6.38² =
  7. 7.49² =
  8. 8.78² =
  9. 9.57² =
  10. 10.75² =
  11. 11.58² =
  12. 12.53² =
  13. 13.51² =
  14. 14.94² =
  15. 15.61² =
  16. 16.95² =
  17. 17.62² =
  18. 18.79² =
  19. 19.54² =
  20. 20.98² =
  21. 21.96² =
  22. 22.73² =
  23. 23.69² =
  24. 24.44² =
  25. 25.41² =
  26. 26.91² =
  27. 27.64² =
  28. 28.82² =
  29. 29.74² =
  30. 30.48² =
  31. 31.76² =
  32. 32.71² =
  33. 33.34² =
  34. 34.39² =
  35. 35.89² =
  36. 36.67² =
  37. 37.81² =
  38. 38.42² =
  39. 39.59² =
  40. 40.35² =

Answer key

  1. 1849
  2. 3136
  3. 1089
  4. 5929
  5. 3969
  6. 1444
  7. 2401
  8. 6084
  9. 3249
  10. 5625
  11. 3364
  12. 2809
  13. 2601
  14. 8836
  15. 3721
  16. 9025
  17. 3844
  18. 6241
  19. 2916
  20. 9604
  21. 9216
  22. 5329
  23. 4761
  24. 1936
  25. 1681
  26. 8281
  27. 4096
  28. 6724
  29. 5476
  30. 2304
  31. 5776
  32. 5041
  33. 1156
  34. 1521
  35. 7921
  36. 4489
  37. 6561
  38. 1764
  39. 3481
  40. 1225

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