← 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 975 · 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. 1.49² =
  2. 2.89² =
  3. 3.76² =
  4. 4.53² =
  5. 5.58² =
  6. 6.51² =
  7. 7.66² =
  8. 8.78² =
  9. 9.62² =
  10. 10.34² =
  11. 11.46² =
  12. 12.31² =
  13. 13.33² =
  14. 14.97² =
  15. 15.56² =
  16. 16.96² =
  17. 17.81² =
  18. 18.59² =
  19. 19.52² =
  20. 20.92² =
  21. 21.79² =
  22. 22.69² =
  23. 23.55² =
  24. 24.57² =
  25. 25.41² =
  26. 26.39² =
  27. 27.38² =
  28. 28.84² =
  29. 29.91² =
  30. 30.64² =
  31. 31.67² =
  32. 32.87² =
  33. 33.72² =
  34. 34.95² =
  35. 35.42² =
  36. 36.94² =
  37. 37.74² =
  38. 38.86² =
  39. 39.47² =
  40. 40.83² =

Answer key

  1. 2401
  2. 7921
  3. 5776
  4. 2809
  5. 3364
  6. 2601
  7. 4356
  8. 6084
  9. 3844
  10. 1156
  11. 2116
  12. 961
  13. 1089
  14. 9409
  15. 3136
  16. 9216
  17. 6561
  18. 3481
  19. 2704
  20. 8464
  21. 6241
  22. 4761
  23. 3025
  24. 3249
  25. 1681
  26. 1521
  27. 1444
  28. 7056
  29. 8281
  30. 4096
  31. 4489
  32. 7569
  33. 5184
  34. 9025
  35. 1764
  36. 8836
  37. 5476
  38. 7396
  39. 2209
  40. 6889

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