← 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 562 · 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. 2.78² =
  3. 3.79² =
  4. 4.34² =
  5. 5.55² =
  6. 6.76² =
  7. 7.51² =
  8. 8.68² =
  9. 9.44² =
  10. 10.35² =
  11. 11.91² =
  12. 12.52² =
  13. 13.85² =
  14. 14.86² =
  15. 15.64² =
  16. 16.81² =
  17. 17.92² =
  18. 18.36² =
  19. 19.39² =
  20. 20.54² =
  21. 21.87² =
  22. 22.75² =
  23. 23.82² =
  24. 24.33² =
  25. 25.95² =
  26. 26.53² =
  27. 27.31² =
  28. 28.43² =
  29. 29.96² =
  30. 30.58² =
  31. 31.69² =
  32. 32.98² =
  33. 33.63² =
  34. 34.61² =
  35. 35.56² =
  36. 36.47² =
  37. 37.99² =
  38. 38.42² =
  39. 39.71² =
  40. 40.73² =

Answer key

  1. 7921
  2. 6084
  3. 6241
  4. 1156
  5. 3025
  6. 5776
  7. 2601
  8. 4624
  9. 1936
  10. 1225
  11. 8281
  12. 2704
  13. 7225
  14. 7396
  15. 4096
  16. 6561
  17. 8464
  18. 1296
  19. 1521
  20. 2916
  21. 7569
  22. 5625
  23. 6724
  24. 1089
  25. 9025
  26. 2809
  27. 961
  28. 1849
  29. 9216
  30. 3364
  31. 4761
  32. 9604
  33. 3969
  34. 3721
  35. 3136
  36. 2209
  37. 9801
  38. 1764
  39. 5041
  40. 5329

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