← 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 888 · 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. 2.72² =
  3. 3.97² =
  4. 4.39² =
  5. 5.43² =
  6. 6.69² =
  7. 7.95² =
  8. 8.31² =
  9. 9.46² =
  10. 10.87² =
  11. 11.66² =
  12. 12.91² =
  13. 13.88² =
  14. 14.94² =
  15. 15.33² =
  16. 16.54² =
  17. 17.32² =
  18. 18.35² =
  19. 19.71² =
  20. 20.62² =
  21. 21.78² =
  22. 22.59² =
  23. 23.41² =
  24. 24.83² =
  25. 25.45² =
  26. 26.55² =
  27. 27.98² =
  28. 28.51² =
  29. 29.42² =
  30. 30.49² =
  31. 31.79² =
  32. 32.34² =
  33. 33.67² =
  34. 34.61² =
  35. 35.81² =
  36. 36.73² =
  37. 37.82² =
  38. 38.47² =
  39. 39.93² =
  40. 40.76² =

Answer key

  1. 1444
  2. 5184
  3. 9409
  4. 1521
  5. 1849
  6. 4761
  7. 9025
  8. 961
  9. 2116
  10. 7569
  11. 4356
  12. 8281
  13. 7744
  14. 8836
  15. 1089
  16. 2916
  17. 1024
  18. 1225
  19. 5041
  20. 3844
  21. 6084
  22. 3481
  23. 1681
  24. 6889
  25. 2025
  26. 3025
  27. 9604
  28. 2601
  29. 1764
  30. 2401
  31. 6241
  32. 1156
  33. 4489
  34. 3721
  35. 6561
  36. 5329
  37. 6724
  38. 2209
  39. 8649
  40. 5776

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