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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 492 · 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. 1.99² =
  2. 2.87² =
  3. 3.65² =
  4. 4.46² =
  5. 5.37² =
  6. 6.39² =
  7. 7.88² =
  8. 8.84² =
  9. 9.76² =
  10. 10.41² =
  11. 11.75² =
  12. 12.78² =
  13. 13.31² =
  14. 14.52² =
  15. 15.49² =
  16. 16.45² =
  17. 17.61² =
  18. 18.95² =
  19. 19.89² =
  20. 20.91² =
  21. 21.79² =
  22. 22.38² =
  23. 23.43² =
  24. 24.56² =
  25. 25.47² =
  26. 26.77² =
  27. 27.67² =
  28. 28.97² =
  29. 29.74² =
  30. 30.59² =
  31. 31.83² =
  32. 32.73² =
  33. 33.82² =
  34. 34.64² =
  35. 35.72² =
  36. 36.92² =
  37. 37.57² =
  38. 38.81² =
  39. 39.71² =
  40. 40.63² =

Answer key

  1. 9801
  2. 7569
  3. 4225
  4. 2116
  5. 1369
  6. 1521
  7. 7744
  8. 7056
  9. 5776
  10. 1681
  11. 5625
  12. 6084
  13. 961
  14. 2704
  15. 2401
  16. 2025
  17. 3721
  18. 9025
  19. 7921
  20. 8281
  21. 6241
  22. 1444
  23. 1849
  24. 3136
  25. 2209
  26. 5929
  27. 4489
  28. 9409
  29. 5476
  30. 3481
  31. 6889
  32. 5329
  33. 6724
  34. 4096
  35. 5184
  36. 8464
  37. 3249
  38. 6561
  39. 5041
  40. 3969

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