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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 618 · 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. 1.67² =
  2. 2.73² =
  3. 3.41² =
  4. 4.98² =
  5. 5.53² =
  6. 6.62² =
  7. 7.59² =
  8. 8.61² =
  9. 9.63² =
  10. 10.39² =
  11. 11.44² =
  12. 12.81² =
  13. 13.99² =
  14. 14.38² =
  15. 15.43² =
  16. 16.46² =
  17. 17.71² =
  18. 18.48² =
  19. 19.89² =
  20. 20.54² =
  21. 21.52² =
  22. 22.65² =
  23. 23.86² =
  24. 24.49² =
  25. 25.95² =
  26. 26.66² =
  27. 27.82² =
  28. 28.32² =
  29. 29.51² =
  30. 30.31² =
  31. 31.88² =
  32. 32.91² =
  33. 33.69² =
  34. 34.37² =
  35. 35.96² =
  36. 36.68² =
  37. 37.56² =
  38. 38.47² =
  39. 39.58² =
  40. 40.35² =

Answer key

  1. 4489
  2. 5329
  3. 1681
  4. 9604
  5. 2809
  6. 3844
  7. 3481
  8. 3721
  9. 3969
  10. 1521
  11. 1936
  12. 6561
  13. 9801
  14. 1444
  15. 1849
  16. 2116
  17. 5041
  18. 2304
  19. 7921
  20. 2916
  21. 2704
  22. 4225
  23. 7396
  24. 2401
  25. 9025
  26. 4356
  27. 6724
  28. 1024
  29. 2601
  30. 961
  31. 7744
  32. 8281
  33. 4761
  34. 1369
  35. 9216
  36. 4624
  37. 3136
  38. 2209
  39. 3364
  40. 1225

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