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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 796 · 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. 1.71² =
  2. 2.86² =
  3. 3.56² =
  4. 4.61² =
  5. 5.47² =
  6. 6.58² =
  7. 7.65² =
  8. 8.35² =
  9. 9.84² =
  10. 10.37² =
  11. 11.43² =
  12. 12.38² =
  13. 13.69² =
  14. 14.76² =
  15. 15.41² =
  16. 16.97² =
  17. 17.95² =
  18. 18.74² =
  19. 19.39² =
  20. 20.92² =
  21. 21.62² =
  22. 22.83² =
  23. 23.91² =
  24. 24.81² =
  25. 25.54² =
  26. 26.94² =
  27. 27.98² =
  28. 28.44² =
  29. 29.77² =
  30. 30.48² =
  31. 31.51² =
  32. 32.52² =
  33. 33.63² =
  34. 34.99² =
  35. 35.59² =
  36. 36.33² =
  37. 37.57² =
  38. 38.66² =
  39. 39.32² =
  40. 40.93² =

Answer key

  1. 5041
  2. 7396
  3. 3136
  4. 3721
  5. 2209
  6. 3364
  7. 4225
  8. 1225
  9. 7056
  10. 1369
  11. 1849
  12. 1444
  13. 4761
  14. 5776
  15. 1681
  16. 9409
  17. 9025
  18. 5476
  19. 1521
  20. 8464
  21. 3844
  22. 6889
  23. 8281
  24. 6561
  25. 2916
  26. 8836
  27. 9604
  28. 1936
  29. 5929
  30. 2304
  31. 2601
  32. 2704
  33. 3969
  34. 9801
  35. 3481
  36. 1089
  37. 3249
  38. 4356
  39. 1024
  40. 8649

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