← 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 613 · 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. 2.43² =
  3. 3.85² =
  4. 4.83² =
  5. 5.74² =
  6. 6.87² =
  7. 7.44² =
  8. 8.82² =
  9. 9.79² =
  10. 10.33² =
  11. 11.86² =
  12. 12.66² =
  13. 13.76² =
  14. 14.75² =
  15. 15.36² =
  16. 16.41² =
  17. 17.95² =
  18. 18.57² =
  19. 19.84² =
  20. 20.78² =
  21. 21.31² =
  22. 22.81² =
  23. 23.38² =
  24. 24.68² =
  25. 25.53² =
  26. 26.48² =
  27. 27.97² =
  28. 28.34² =
  29. 29.45² =
  30. 30.73² =
  31. 31.91² =
  32. 32.46² =
  33. 33.55² =
  34. 34.49² =
  35. 35.39² =
  36. 36.61² =
  37. 37.35² =
  38. 38.77² =
  39. 39.88² =
  40. 40.71² =

Answer key

  1. 2601
  2. 1849
  3. 7225
  4. 6889
  5. 5476
  6. 7569
  7. 1936
  8. 6724
  9. 6241
  10. 1089
  11. 7396
  12. 4356
  13. 5776
  14. 5625
  15. 1296
  16. 1681
  17. 9025
  18. 3249
  19. 7056
  20. 6084
  21. 961
  22. 6561
  23. 1444
  24. 4624
  25. 2809
  26. 2304
  27. 9409
  28. 1156
  29. 2025
  30. 5329
  31. 8281
  32. 2116
  33. 3025
  34. 2401
  35. 1521
  36. 3721
  37. 1225
  38. 5929
  39. 7744
  40. 5041

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