← 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 100 · 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. 1.61² =
  2. 2.59² =
  3. 3.43² =
  4. 4.74² =
  5. 5.42² =
  6. 6.48² =
  7. 7.58² =
  8. 8.68² =
  9. 9.91² =
  10. 10.37² =
  11. 11.53² =
  12. 12.35² =
  13. 13.46² =
  14. 14.75² =
  15. 15.51² =
  16. 16.31² =
  17. 17.95² =
  18. 18.41² =
  19. 19.96² =
  20. 20.57² =
  21. 21.49² =
  22. 22.36² =
  23. 23.54² =
  24. 24.55² =
  25. 25.73² =
  26. 26.78² =
  27. 27.84² =
  28. 28.63² =
  29. 29.77² =
  30. 30.47² =
  31. 31.39² =
  32. 32.67² =
  33. 33.85² =
  34. 34.79² =
  35. 35.71² =
  36. 36.86² =
  37. 37.83² =
  38. 38.76² =
  39. 39.33² =
  40. 40.72² =

Answer key

  1. 3721
  2. 3481
  3. 1849
  4. 5476
  5. 1764
  6. 2304
  7. 3364
  8. 4624
  9. 8281
  10. 1369
  11. 2809
  12. 1225
  13. 2116
  14. 5625
  15. 2601
  16. 961
  17. 9025
  18. 1681
  19. 9216
  20. 3249
  21. 2401
  22. 1296
  23. 2916
  24. 3025
  25. 5329
  26. 6084
  27. 7056
  28. 3969
  29. 5929
  30. 2209
  31. 1521
  32. 4489
  33. 7225
  34. 6241
  35. 5041
  36. 7396
  37. 6889
  38. 5776
  39. 1089
  40. 5184

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