← 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 335 · 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. 2.44² =
  3. 3.99² =
  4. 4.57² =
  5. 5.41² =
  6. 6.55² =
  7. 7.45² =
  8. 8.86² =
  9. 9.58² =
  10. 10.78² =
  11. 11.79² =
  12. 12.68² =
  13. 13.31² =
  14. 14.48² =
  15. 15.61² =
  16. 16.88² =
  17. 17.34² =
  18. 18.93² =
  19. 19.49² =
  20. 20.92² =
  21. 21.81² =
  22. 22.84² =
  23. 23.82² =
  24. 24.91² =
  25. 25.77² =
  26. 26.38² =
  27. 27.76² =
  28. 28.43² =
  29. 29.95² =
  30. 30.54² =
  31. 31.36² =
  32. 32.37² =
  33. 33.64² =
  34. 34.72² =
  35. 35.71² =
  36. 36.51² =
  37. 37.39² =
  38. 38.73² =
  39. 39.96² =
  40. 40.52² =

Answer key

  1. 7921
  2. 1936
  3. 9801
  4. 3249
  5. 1681
  6. 3025
  7. 2025
  8. 7396
  9. 3364
  10. 6084
  11. 6241
  12. 4624
  13. 961
  14. 2304
  15. 3721
  16. 7744
  17. 1156
  18. 8649
  19. 2401
  20. 8464
  21. 6561
  22. 7056
  23. 6724
  24. 8281
  25. 5929
  26. 1444
  27. 5776
  28. 1849
  29. 9025
  30. 2916
  31. 1296
  32. 1369
  33. 4096
  34. 5184
  35. 5041
  36. 2601
  37. 1521
  38. 5329
  39. 9216
  40. 2704

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