← 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 971 · 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. 1.84² =
  2. 2.79² =
  3. 3.31² =
  4. 4.83² =
  5. 5.46² =
  6. 6.72² =
  7. 7.64² =
  8. 8.91² =
  9. 9.73² =
  10. 10.74² =
  11. 11.51² =
  12. 12.39² =
  13. 13.59² =
  14. 14.89² =
  15. 15.75² =
  16. 16.87² =
  17. 17.37² =
  18. 18.48² =
  19. 19.92² =
  20. 20.97² =
  21. 21.55² =
  22. 22.63² =
  23. 23.52² =
  24. 24.82² =
  25. 25.47² =
  26. 26.67² =
  27. 27.99² =
  28. 28.78² =
  29. 29.61² =
  30. 30.53² =
  31. 31.94² =
  32. 32.62² =
  33. 33.56² =
  34. 34.36² =
  35. 35.35² =
  36. 36.32² =
  37. 37.38² =
  38. 38.98² =
  39. 39.76² =
  40. 40.81² =

Answer key

  1. 7056
  2. 6241
  3. 961
  4. 6889
  5. 2116
  6. 5184
  7. 4096
  8. 8281
  9. 5329
  10. 5476
  11. 2601
  12. 1521
  13. 3481
  14. 7921
  15. 5625
  16. 7569
  17. 1369
  18. 2304
  19. 8464
  20. 9409
  21. 3025
  22. 3969
  23. 2704
  24. 6724
  25. 2209
  26. 4489
  27. 9801
  28. 6084
  29. 3721
  30. 2809
  31. 8836
  32. 3844
  33. 3136
  34. 1296
  35. 1225
  36. 1024
  37. 1444
  38. 9604
  39. 5776
  40. 6561

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