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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 401 · 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. 1.48² =
  2. 2.56² =
  3. 3.62² =
  4. 4.65² =
  5. 5.94² =
  6. 6.71² =
  7. 7.81² =
  8. 8.66² =
  9. 9.79² =
  10. 10.47² =
  11. 11.52² =
  12. 12.91² =
  13. 13.95² =
  14. 14.93² =
  15. 15.49² =
  16. 16.36² =
  17. 17.58² =
  18. 18.61² =
  19. 19.99² =
  20. 20.98² =
  21. 21.73² =
  22. 22.87² =
  23. 23.51² =
  24. 24.33² =
  25. 25.31² =
  26. 26.86² =
  27. 27.96² =
  28. 28.74² =
  29. 29.69² =
  30. 30.46² =
  31. 31.97² =
  32. 32.41² =
  33. 33.57² =
  34. 34.38² =
  35. 35.34² =
  36. 36.45² =
  37. 37.44² =
  38. 38.78² =
  39. 39.42² =
  40. 40.64² =

Answer key

  1. 2304
  2. 3136
  3. 3844
  4. 4225
  5. 8836
  6. 5041
  7. 6561
  8. 4356
  9. 6241
  10. 2209
  11. 2704
  12. 8281
  13. 9025
  14. 8649
  15. 2401
  16. 1296
  17. 3364
  18. 3721
  19. 9801
  20. 9604
  21. 5329
  22. 7569
  23. 2601
  24. 1089
  25. 961
  26. 7396
  27. 9216
  28. 5476
  29. 4761
  30. 2116
  31. 9409
  32. 1681
  33. 3249
  34. 1444
  35. 1156
  36. 2025
  37. 1936
  38. 6084
  39. 1764
  40. 4096

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