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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 757 · 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. 2.77² =
  3. 3.41² =
  4. 4.86² =
  5. 5.91² =
  6. 6.72² =
  7. 7.31² =
  8. 8.87² =
  9. 9.81² =
  10. 10.51² =
  11. 11.95² =
  12. 12.99² =
  13. 13.88² =
  14. 14.43² =
  15. 15.37² =
  16. 16.71² =
  17. 17.45² =
  18. 18.64² =
  19. 19.76² =
  20. 20.93² =
  21. 21.48² =
  22. 22.84² =
  23. 23.98² =
  24. 24.33² =
  25. 25.66² =
  26. 26.65² =
  27. 27.73² =
  28. 28.35² =
  29. 29.47² =
  30. 30.94² =
  31. 31.56² =
  32. 32.53² =
  33. 33.32² =
  34. 34.39² =
  35. 35.59² =
  36. 36.89² =
  37. 37.49² =
  38. 38.46² =
  39. 39.63² =
  40. 40.52² =

Answer key

  1. 4489
  2. 5929
  3. 1681
  4. 7396
  5. 8281
  6. 5184
  7. 961
  8. 7569
  9. 6561
  10. 2601
  11. 9025
  12. 9801
  13. 7744
  14. 1849
  15. 1369
  16. 5041
  17. 2025
  18. 4096
  19. 5776
  20. 8649
  21. 2304
  22. 7056
  23. 9604
  24. 1089
  25. 4356
  26. 4225
  27. 5329
  28. 1225
  29. 2209
  30. 8836
  31. 3136
  32. 2809
  33. 1024
  34. 1521
  35. 3481
  36. 7921
  37. 2401
  38. 2116
  39. 3969
  40. 2704

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