← 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 197 · 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. 1.43² =
  2. 2.32² =
  3. 3.95² =
  4. 4.52² =
  5. 5.99² =
  6. 6.61² =
  7. 7.38² =
  8. 8.81² =
  9. 9.56² =
  10. 10.45² =
  11. 11.62² =
  12. 12.55² =
  13. 13.58² =
  14. 14.98² =
  15. 15.75² =
  16. 16.96² =
  17. 17.33² =
  18. 18.36² =
  19. 19.79² =
  20. 20.92² =
  21. 21.51² =
  22. 22.49² =
  23. 23.67² =
  24. 24.71² =
  25. 25.57² =
  26. 26.89² =
  27. 27.69² =
  28. 28.74² =
  29. 29.93² =
  30. 30.46² =
  31. 31.41² =
  32. 32.65² =
  33. 33.94² =
  34. 34.97² =
  35. 35.34² =
  36. 36.54² =
  37. 37.85² =
  38. 38.66² =
  39. 39.39² =
  40. 40.91² =

Answer key

  1. 1849
  2. 1024
  3. 9025
  4. 2704
  5. 9801
  6. 3721
  7. 1444
  8. 6561
  9. 3136
  10. 2025
  11. 3844
  12. 3025
  13. 3364
  14. 9604
  15. 5625
  16. 9216
  17. 1089
  18. 1296
  19. 6241
  20. 8464
  21. 2601
  22. 2401
  23. 4489
  24. 5041
  25. 3249
  26. 7921
  27. 4761
  28. 5476
  29. 8649
  30. 2116
  31. 1681
  32. 4225
  33. 8836
  34. 9409
  35. 1156
  36. 2916
  37. 7225
  38. 4356
  39. 1521
  40. 8281

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