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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 672 · 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. 1.81² =
  2. 2.52² =
  3. 3.76² =
  4. 4.48² =
  5. 5.32² =
  6. 6.84² =
  7. 7.57² =
  8. 8.91² =
  9. 9.97² =
  10. 10.65² =
  11. 11.41² =
  12. 12.45² =
  13. 13.66² =
  14. 14.55² =
  15. 15.38² =
  16. 16.37² =
  17. 17.74² =
  18. 18.51² =
  19. 19.43² =
  20. 20.56² =
  21. 21.69² =
  22. 22.68² =
  23. 23.67² =
  24. 24.64² =
  25. 25.58² =
  26. 26.95² =
  27. 27.88² =
  28. 28.94² =
  29. 29.44² =
  30. 30.42² =
  31. 31.75² =
  32. 32.36² =
  33. 33.86² =
  34. 34.35² =
  35. 35.31² =
  36. 36.33² =
  37. 37.82² =
  38. 38.98² =
  39. 39.62² =
  40. 40.49² =

Answer key

  1. 6561
  2. 2704
  3. 5776
  4. 2304
  5. 1024
  6. 7056
  7. 3249
  8. 8281
  9. 9409
  10. 4225
  11. 1681
  12. 2025
  13. 4356
  14. 3025
  15. 1444
  16. 1369
  17. 5476
  18. 2601
  19. 1849
  20. 3136
  21. 4761
  22. 4624
  23. 4489
  24. 4096
  25. 3364
  26. 9025
  27. 7744
  28. 8836
  29. 1936
  30. 1764
  31. 5625
  32. 1296
  33. 7396
  34. 1225
  35. 961
  36. 1089
  37. 6724
  38. 9604
  39. 3844
  40. 2401

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