← 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 161 · 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. 1.32² =
  2. 2.76² =
  3. 3.74² =
  4. 4.97² =
  5. 5.49² =
  6. 6.41² =
  7. 7.75² =
  8. 8.71² =
  9. 9.36² =
  10. 10.39² =
  11. 11.79² =
  12. 12.38² =
  13. 13.73² =
  14. 14.55² =
  15. 15.47² =
  16. 16.99² =
  17. 17.51² =
  18. 18.37² =
  19. 19.44² =
  20. 20.65² =
  21. 21.94² =
  22. 22.98² =
  23. 23.42² =
  24. 24.96² =
  25. 25.61² =
  26. 26.54² =
  27. 27.45² =
  28. 28.78² =
  29. 29.84² =
  30. 30.48² =
  31. 31.59² =
  32. 32.87² =
  33. 33.33² =
  34. 34.67² =
  35. 35.85² =
  36. 36.88² =
  37. 37.52² =
  38. 38.41² =
  39. 39.68² =
  40. 40.56² =

Answer key

  1. 1024
  2. 5776
  3. 5476
  4. 9409
  5. 2401
  6. 1681
  7. 5625
  8. 5041
  9. 1296
  10. 1521
  11. 6241
  12. 1444
  13. 5329
  14. 3025
  15. 2209
  16. 9801
  17. 2601
  18. 1369
  19. 1936
  20. 4225
  21. 8836
  22. 9604
  23. 1764
  24. 9216
  25. 3721
  26. 2916
  27. 2025
  28. 6084
  29. 7056
  30. 2304
  31. 3481
  32. 7569
  33. 1089
  34. 4489
  35. 7225
  36. 7744
  37. 2704
  38. 1681
  39. 4624
  40. 3136

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