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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 568 · 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. 1.92² =
  2. 2.55² =
  3. 3.84² =
  4. 4.97² =
  5. 5.71² =
  6. 6.74² =
  7. 7.94² =
  8. 8.75² =
  9. 9.35² =
  10. 10.52² =
  11. 11.43² =
  12. 12.56² =
  13. 13.69² =
  14. 14.99² =
  15. 15.57² =
  16. 16.85² =
  17. 17.72² =
  18. 18.96² =
  19. 19.37² =
  20. 20.88² =
  21. 21.39² =
  22. 22.64² =
  23. 23.95² =
  24. 24.49² =
  25. 25.31² =
  26. 26.54² =
  27. 27.81² =
  28. 28.76² =
  29. 29.38² =
  30. 30.91² =
  31. 31.47² =
  32. 32.32² =
  33. 33.86² =
  34. 34.87² =
  35. 35.98² =
  36. 36.77² =
  37. 37.33² =
  38. 38.66² =
  39. 39.51² =
  40. 40.41² =

Answer key

  1. 8464
  2. 3025
  3. 7056
  4. 9409
  5. 5041
  6. 5476
  7. 8836
  8. 5625
  9. 1225
  10. 2704
  11. 1849
  12. 3136
  13. 4761
  14. 9801
  15. 3249
  16. 7225
  17. 5184
  18. 9216
  19. 1369
  20. 7744
  21. 1521
  22. 4096
  23. 9025
  24. 2401
  25. 961
  26. 2916
  27. 6561
  28. 5776
  29. 1444
  30. 8281
  31. 2209
  32. 1024
  33. 7396
  34. 7569
  35. 9604
  36. 5929
  37. 1089
  38. 4356
  39. 2601
  40. 1681

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