← 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 353 · 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. 1.51² =
  2. 2.69² =
  3. 3.83² =
  4. 4.62² =
  5. 5.33² =
  6. 6.76² =
  7. 7.82² =
  8. 8.95² =
  9. 9.59² =
  10. 10.45² =
  11. 11.85² =
  12. 12.78² =
  13. 13.52² =
  14. 14.46² =
  15. 15.71² =
  16. 16.47² =
  17. 17.44² =
  18. 18.58² =
  19. 19.61² =
  20. 20.91² =
  21. 21.98² =
  22. 22.42² =
  23. 23.41² =
  24. 24.92² =
  25. 25.79² =
  26. 26.36² =
  27. 27.53² =
  28. 28.32² =
  29. 29.89² =
  30. 30.34² =
  31. 31.54² =
  32. 32.68² =
  33. 33.48² =
  34. 34.55² =
  35. 35.63² =
  36. 36.43² =
  37. 37.65² =
  38. 38.38² =
  39. 39.31² =
  40. 40.64² =

Answer key

  1. 2601
  2. 4761
  3. 6889
  4. 3844
  5. 1089
  6. 5776
  7. 6724
  8. 9025
  9. 3481
  10. 2025
  11. 7225
  12. 6084
  13. 2704
  14. 2116
  15. 5041
  16. 2209
  17. 1936
  18. 3364
  19. 3721
  20. 8281
  21. 9604
  22. 1764
  23. 1681
  24. 8464
  25. 6241
  26. 1296
  27. 2809
  28. 1024
  29. 7921
  30. 1156
  31. 2916
  32. 4624
  33. 2304
  34. 3025
  35. 3969
  36. 1849
  37. 4225
  38. 1444
  39. 961
  40. 4096

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