← 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 424 · 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. 1.38² =
  2. 2.94² =
  3. 3.75² =
  4. 4.79² =
  5. 5.31² =
  6. 6.87² =
  7. 7.37² =
  8. 8.97² =
  9. 9.41² =
  10. 10.42² =
  11. 11.51² =
  12. 12.99² =
  13. 13.33² =
  14. 14.71² =
  15. 15.35² =
  16. 16.81² =
  17. 17.64² =
  18. 18.58² =
  19. 19.49² =
  20. 20.91² =
  21. 21.48² =
  22. 22.32² =
  23. 23.82² =
  24. 24.52² =
  25. 25.96² =
  26. 26.89² =
  27. 27.46² =
  28. 28.45² =
  29. 29.84² =
  30. 30.65² =
  31. 31.66² =
  32. 32.59² =
  33. 33.67² =
  34. 34.43² =
  35. 35.39² =
  36. 36.54² =
  37. 37.47² =
  38. 38.36² =
  39. 39.61² =
  40. 40.56² =

Answer key

  1. 1444
  2. 8836
  3. 5625
  4. 6241
  5. 961
  6. 7569
  7. 1369
  8. 9409
  9. 1681
  10. 1764
  11. 2601
  12. 9801
  13. 1089
  14. 5041
  15. 1225
  16. 6561
  17. 4096
  18. 3364
  19. 2401
  20. 8281
  21. 2304
  22. 1024
  23. 6724
  24. 2704
  25. 9216
  26. 7921
  27. 2116
  28. 2025
  29. 7056
  30. 4225
  31. 4356
  32. 3481
  33. 4489
  34. 1849
  35. 1521
  36. 2916
  37. 2209
  38. 1296
  39. 3721
  40. 3136

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