← 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 811 · 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. 1.47² =
  2. 2.51² =
  3. 3.49² =
  4. 4.37² =
  5. 5.94² =
  6. 6.41² =
  7. 7.48² =
  8. 8.71² =
  9. 9.36² =
  10. 10.92² =
  11. 11.99² =
  12. 12.33² =
  13. 13.81² =
  14. 14.88² =
  15. 15.75² =
  16. 16.68² =
  17. 17.54² =
  18. 18.52² =
  19. 19.31² =
  20. 20.76² =
  21. 21.45² =
  22. 22.65² =
  23. 23.67² =
  24. 24.72² =
  25. 25.53² =
  26. 26.66² =
  27. 27.58² =
  28. 28.43² =
  29. 29.61² =
  30. 30.59² =
  31. 31.89² =
  32. 32.46² =
  33. 33.84² =
  34. 34.57² =
  35. 35.69² =
  36. 36.38² =
  37. 37.82² =
  38. 38.62² =
  39. 39.44² =
  40. 40.83² =

Answer key

  1. 2209
  2. 2601
  3. 2401
  4. 1369
  5. 8836
  6. 1681
  7. 2304
  8. 5041
  9. 1296
  10. 8464
  11. 9801
  12. 1089
  13. 6561
  14. 7744
  15. 5625
  16. 4624
  17. 2916
  18. 2704
  19. 961
  20. 5776
  21. 2025
  22. 4225
  23. 4489
  24. 5184
  25. 2809
  26. 4356
  27. 3364
  28. 1849
  29. 3721
  30. 3481
  31. 7921
  32. 2116
  33. 7056
  34. 3249
  35. 4761
  36. 1444
  37. 6724
  38. 3844
  39. 1936
  40. 6889

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