← 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 958 · 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. 1.36² =
  2. 2.81² =
  3. 3.45² =
  4. 4.79² =
  5. 5.82² =
  6. 6.66² =
  7. 7.37² =
  8. 8.73² =
  9. 9.61² =
  10. 10.59² =
  11. 11.48² =
  12. 12.69² =
  13. 13.51² =
  14. 14.47² =
  15. 15.31² =
  16. 16.54² =
  17. 17.98² =
  18. 18.96² =
  19. 19.83² =
  20. 20.39² =
  21. 21.99² =
  22. 22.78² =
  23. 23.71² =
  24. 24.44² =
  25. 25.52² =
  26. 26.95² =
  27. 27.89² =
  28. 28.32² =
  29. 29.74² =
  30. 30.34² =
  31. 31.65² =
  32. 32.87² =
  33. 33.77² =
  34. 34.88² =
  35. 35.86² =
  36. 36.63² =
  37. 37.85² =
  38. 38.58² =
  39. 39.92² =
  40. 40.72² =

Answer key

  1. 1296
  2. 6561
  3. 2025
  4. 6241
  5. 6724
  6. 4356
  7. 1369
  8. 5329
  9. 3721
  10. 3481
  11. 2304
  12. 4761
  13. 2601
  14. 2209
  15. 961
  16. 2916
  17. 9604
  18. 9216
  19. 6889
  20. 1521
  21. 9801
  22. 6084
  23. 5041
  24. 1936
  25. 2704
  26. 9025
  27. 7921
  28. 1024
  29. 5476
  30. 1156
  31. 4225
  32. 7569
  33. 5929
  34. 7744
  35. 7396
  36. 3969
  37. 7225
  38. 3364
  39. 8464
  40. 5184

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