← 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 145 · 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. 1.89² =
  2. 2.68² =
  3. 3.71² =
  4. 4.64² =
  5. 5.66² =
  6. 6.53² =
  7. 7.65² =
  8. 8.31² =
  9. 9.76² =
  10. 10.35² =
  11. 11.92² =
  12. 12.47² =
  13. 13.42² =
  14. 14.51² =
  15. 15.48² =
  16. 16.91² =
  17. 17.98² =
  18. 18.57² =
  19. 19.46² =
  20. 20.54² =
  21. 21.61² =
  22. 22.55² =
  23. 23.36² =
  24. 24.45² =
  25. 25.41² =
  26. 26.59² =
  27. 27.34² =
  28. 28.78² =
  29. 29.58² =
  30. 30.94² =
  31. 31.86² =
  32. 32.38² =
  33. 33.95² =
  34. 34.84² =
  35. 35.93² =
  36. 36.97² =
  37. 37.72² =
  38. 38.83² =
  39. 39.56² =
  40. 40.85² =

Answer key

  1. 7921
  2. 4624
  3. 5041
  4. 4096
  5. 4356
  6. 2809
  7. 4225
  8. 961
  9. 5776
  10. 1225
  11. 8464
  12. 2209
  13. 1764
  14. 2601
  15. 2304
  16. 8281
  17. 9604
  18. 3249
  19. 2116
  20. 2916
  21. 3721
  22. 3025
  23. 1296
  24. 2025
  25. 1681
  26. 3481
  27. 1156
  28. 6084
  29. 3364
  30. 8836
  31. 7396
  32. 1444
  33. 9025
  34. 7056
  35. 8649
  36. 9409
  37. 5184
  38. 6889
  39. 3136
  40. 7225

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