← 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 837 · 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. 1.32² =
  2. 2.89² =
  3. 3.63² =
  4. 4.79² =
  5. 5.48² =
  6. 6.33² =
  7. 7.37² =
  8. 8.58² =
  9. 9.67² =
  10. 10.55² =
  11. 11.44² =
  12. 12.41² =
  13. 13.94² =
  14. 14.49² =
  15. 15.36² =
  16. 16.43² =
  17. 17.54² =
  18. 18.56² =
  19. 19.51² =
  20. 20.62² =
  21. 21.93² =
  22. 22.34² =
  23. 23.97² =
  24. 24.82² =
  25. 25.71² =
  26. 26.86² =
  27. 27.81² =
  28. 28.59² =
  29. 29.61² =
  30. 30.75² =
  31. 31.84² =
  32. 32.76² =
  33. 33.31² =
  34. 34.91² =
  35. 35.98² =
  36. 36.95² =
  37. 37.46² =
  38. 38.83² =
  39. 39.68² =
  40. 40.78² =

Answer key

  1. 1024
  2. 7921
  3. 3969
  4. 6241
  5. 2304
  6. 1089
  7. 1369
  8. 3364
  9. 4489
  10. 3025
  11. 1936
  12. 1681
  13. 8836
  14. 2401
  15. 1296
  16. 1849
  17. 2916
  18. 3136
  19. 2601
  20. 3844
  21. 8649
  22. 1156
  23. 9409
  24. 6724
  25. 5041
  26. 7396
  27. 6561
  28. 3481
  29. 3721
  30. 5625
  31. 7056
  32. 5776
  33. 961
  34. 8281
  35. 9604
  36. 9025
  37. 2116
  38. 6889
  39. 4624
  40. 6084

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