← 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 909 · 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. 1.56² =
  2. 2.32² =
  3. 3.92² =
  4. 4.62² =
  5. 5.93² =
  6. 6.73² =
  7. 7.71² =
  8. 8.79² =
  9. 9.66² =
  10. 10.74² =
  11. 11.37² =
  12. 12.33² =
  13. 13.67² =
  14. 14.57² =
  15. 15.84² =
  16. 16.65² =
  17. 17.85² =
  18. 18.51² =
  19. 19.39² =
  20. 20.38² =
  21. 21.61² =
  22. 22.86² =
  23. 23.96² =
  24. 24.42² =
  25. 25.91² =
  26. 26.43² =
  27. 27.36² =
  28. 28.69² =
  29. 29.59² =
  30. 30.52² =
  31. 31.83² =
  32. 32.77² =
  33. 33.97² =
  34. 34.78² =
  35. 35.41² =
  36. 36.44² =
  37. 37.72² =
  38. 38.95² =
  39. 39.98² =
  40. 40.48² =

Answer key

  1. 3136
  2. 1024
  3. 8464
  4. 3844
  5. 8649
  6. 5329
  7. 5041
  8. 6241
  9. 4356
  10. 5476
  11. 1369
  12. 1089
  13. 4489
  14. 3249
  15. 7056
  16. 4225
  17. 7225
  18. 2601
  19. 1521
  20. 1444
  21. 3721
  22. 7396
  23. 9216
  24. 1764
  25. 8281
  26. 1849
  27. 1296
  28. 4761
  29. 3481
  30. 2704
  31. 6889
  32. 5929
  33. 9409
  34. 6084
  35. 1681
  36. 1936
  37. 5184
  38. 9025
  39. 9604
  40. 2304

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