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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 12 · 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. 1.79² =
  2. 2.51² =
  3. 3.36² =
  4. 4.33² =
  5. 5.32² =
  6. 6.54² =
  7. 7.97² =
  8. 8.41² =
  9. 9.95² =
  10. 10.47² =
  11. 11.52² =
  12. 12.43² =
  13. 13.84² =
  14. 14.96² =
  15. 15.69² =
  16. 16.34² =
  17. 17.46² =
  18. 18.82² =
  19. 19.81² =
  20. 20.31² =
  21. 21.65² =
  22. 22.88² =
  23. 23.71² =
  24. 24.91² =
  25. 25.49² =
  26. 26.78² =
  27. 27.94² =
  28. 28.45² =
  29. 29.76² =
  30. 30.58² =
  31. 31.62² =
  32. 32.89² =
  33. 33.53² =
  34. 34.44² =
  35. 35.73² =
  36. 36.64² =
  37. 37.99² =
  38. 38.63² =
  39. 39.98² =
  40. 40.48² =

Answer key

  1. 6241
  2. 2601
  3. 1296
  4. 1089
  5. 1024
  6. 2916
  7. 9409
  8. 1681
  9. 9025
  10. 2209
  11. 2704
  12. 1849
  13. 7056
  14. 9216
  15. 4761
  16. 1156
  17. 2116
  18. 6724
  19. 6561
  20. 961
  21. 4225
  22. 7744
  23. 5041
  24. 8281
  25. 2401
  26. 6084
  27. 8836
  28. 2025
  29. 5776
  30. 3364
  31. 3844
  32. 7921
  33. 2809
  34. 1936
  35. 5329
  36. 4096
  37. 9801
  38. 3969
  39. 9604
  40. 2304

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