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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 365 · 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. 1.84² =
  2. 2.95² =
  3. 3.59² =
  4. 4.57² =
  5. 5.46² =
  6. 6.69² =
  7. 7.48² =
  8. 8.85² =
  9. 9.51² =
  10. 10.41² =
  11. 11.33² =
  12. 12.81² =
  13. 13.71² =
  14. 14.94² =
  15. 15.89² =
  16. 16.99² =
  17. 17.38² =
  18. 18.37² =
  19. 19.47² =
  20. 20.75² =
  21. 21.44² =
  22. 22.62² =
  23. 23.88² =
  24. 24.77² =
  25. 25.53² =
  26. 26.65² =
  27. 27.35² =
  28. 28.86² =
  29. 29.32² =
  30. 30.54² =
  31. 31.56² =
  32. 32.92² =
  33. 33.98² =
  34. 34.66² =
  35. 35.76² =
  36. 36.55² =
  37. 37.45² =
  38. 38.63² =
  39. 39.78² =
  40. 40.68² =

Answer key

  1. 7056
  2. 9025
  3. 3481
  4. 3249
  5. 2116
  6. 4761
  7. 2304
  8. 7225
  9. 2601
  10. 1681
  11. 1089
  12. 6561
  13. 5041
  14. 8836
  15. 7921
  16. 9801
  17. 1444
  18. 1369
  19. 2209
  20. 5625
  21. 1936
  22. 3844
  23. 7744
  24. 5929
  25. 2809
  26. 4225
  27. 1225
  28. 7396
  29. 1024
  30. 2916
  31. 3136
  32. 8464
  33. 9604
  34. 4356
  35. 5776
  36. 3025
  37. 2025
  38. 3969
  39. 6084
  40. 4624

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