← 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 51 · 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. 1.38² =
  2. 2.75² =
  3. 3.99² =
  4. 4.83² =
  5. 5.71² =
  6. 6.34² =
  7. 7.35² =
  8. 8.77² =
  9. 9.33² =
  10. 10.95² =
  11. 11.84² =
  12. 12.43² =
  13. 13.93² =
  14. 14.64² =
  15. 15.66² =
  16. 16.81² =
  17. 17.85² =
  18. 18.47² =
  19. 19.54² =
  20. 20.56² =
  21. 21.94² =
  22. 22.46² =
  23. 23.97² =
  24. 24.48² =
  25. 25.88² =
  26. 26.55² =
  27. 27.44² =
  28. 28.91² =
  29. 29.45² =
  30. 30.53² =
  31. 31.41² =
  32. 32.32² =
  33. 33.39² =
  34. 34.58² =
  35. 35.65² =
  36. 36.74² =
  37. 37.59² =
  38. 38.57² =
  39. 39.98² =
  40. 40.78² =

Answer key

  1. 1444
  2. 5625
  3. 9801
  4. 6889
  5. 5041
  6. 1156
  7. 1225
  8. 5929
  9. 1089
  10. 9025
  11. 7056
  12. 1849
  13. 8649
  14. 4096
  15. 4356
  16. 6561
  17. 7225
  18. 2209
  19. 2916
  20. 3136
  21. 8836
  22. 2116
  23. 9409
  24. 2304
  25. 7744
  26. 3025
  27. 1936
  28. 8281
  29. 2025
  30. 2809
  31. 1681
  32. 1024
  33. 1521
  34. 3364
  35. 4225
  36. 5476
  37. 3481
  38. 3249
  39. 9604
  40. 6084

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