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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 370 · 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. 1.42² =
  2. 2.96² =
  3. 3.91² =
  4. 4.48² =
  5. 5.81² =
  6. 6.98² =
  7. 7.94² =
  8. 8.57² =
  9. 9.34² =
  10. 10.41² =
  11. 11.58² =
  12. 12.43² =
  13. 13.36² =
  14. 14.52² =
  15. 15.63² =
  16. 16.99² =
  17. 17.72² =
  18. 18.32² =
  19. 19.37² =
  20. 20.82² =
  21. 21.95² =
  22. 22.97² =
  23. 23.33² =
  24. 24.73² =
  25. 25.53² =
  26. 26.45² =
  27. 27.59² =
  28. 28.68² =
  29. 29.44² =
  30. 30.61² =
  31. 31.62² =
  32. 32.83² =
  33. 33.51² =
  34. 34.39² =
  35. 35.71² =
  36. 36.56² =
  37. 37.65² =
  38. 38.75² =
  39. 39.84² =
  40. 40.78² =

Answer key

  1. 1764
  2. 9216
  3. 8281
  4. 2304
  5. 6561
  6. 9604
  7. 8836
  8. 3249
  9. 1156
  10. 1681
  11. 3364
  12. 1849
  13. 1296
  14. 2704
  15. 3969
  16. 9801
  17. 5184
  18. 1024
  19. 1369
  20. 6724
  21. 9025
  22. 9409
  23. 1089
  24. 5329
  25. 2809
  26. 2025
  27. 3481
  28. 4624
  29. 1936
  30. 3721
  31. 3844
  32. 6889
  33. 2601
  34. 1521
  35. 5041
  36. 3136
  37. 4225
  38. 5625
  39. 7056
  40. 6084

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