← 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 410 · 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. 1.51² =
  2. 2.75² =
  3. 3.83² =
  4. 4.39² =
  5. 5.48² =
  6. 6.53² =
  7. 7.87² =
  8. 8.35² =
  9. 9.76² =
  10. 10.96² =
  11. 11.61² =
  12. 12.69² =
  13. 13.78² =
  14. 14.77² =
  15. 15.41² =
  16. 16.63² =
  17. 17.72² =
  18. 18.97² =
  19. 19.58² =
  20. 20.82² =
  21. 21.95² =
  22. 22.43² =
  23. 23.73² =
  24. 24.89² =
  25. 25.44² =
  26. 26.37² =
  27. 27.38² =
  28. 28.65² =
  29. 29.67² =
  30. 30.66² =
  31. 31.74² =
  32. 32.31² =
  33. 33.86² =
  34. 34.71² =
  35. 35.54² =
  36. 36.81² =
  37. 37.56² =
  38. 38.98² =
  39. 39.36² =
  40. 40.33² =

Answer key

  1. 2601
  2. 5625
  3. 6889
  4. 1521
  5. 2304
  6. 2809
  7. 7569
  8. 1225
  9. 5776
  10. 9216
  11. 3721
  12. 4761
  13. 6084
  14. 5929
  15. 1681
  16. 3969
  17. 5184
  18. 9409
  19. 3364
  20. 6724
  21. 9025
  22. 1849
  23. 5329
  24. 7921
  25. 1936
  26. 1369
  27. 1444
  28. 4225
  29. 4489
  30. 4356
  31. 5476
  32. 961
  33. 7396
  34. 5041
  35. 2916
  36. 6561
  37. 3136
  38. 9604
  39. 1296
  40. 1089

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