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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 695 · 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. 1.94² =
  2. 2.44² =
  3. 3.36² =
  4. 4.84² =
  5. 5.91² =
  6. 6.47² =
  7. 7.68² =
  8. 8.63² =
  9. 9.51² =
  10. 10.82² =
  11. 11.48² =
  12. 12.56² =
  13. 13.66² =
  14. 14.67² =
  15. 15.65² =
  16. 16.92² =
  17. 17.81² =
  18. 18.85² =
  19. 19.75² =
  20. 20.77² =
  21. 21.52² =
  22. 22.64² =
  23. 23.78² =
  24. 24.71² =
  25. 25.72² =
  26. 26.32² =
  27. 27.54² =
  28. 28.57² =
  29. 29.35² =
  30. 30.95² =
  31. 31.62² =
  32. 32.89² =
  33. 33.74² =
  34. 34.37² =
  35. 35.98² =
  36. 36.49² =
  37. 37.73² =
  38. 38.41² =
  39. 39.97² =
  40. 40.31² =

Answer key

  1. 8836
  2. 1936
  3. 1296
  4. 7056
  5. 8281
  6. 2209
  7. 4624
  8. 3969
  9. 2601
  10. 6724
  11. 2304
  12. 3136
  13. 4356
  14. 4489
  15. 4225
  16. 8464
  17. 6561
  18. 7225
  19. 5625
  20. 5929
  21. 2704
  22. 4096
  23. 6084
  24. 5041
  25. 5184
  26. 1024
  27. 2916
  28. 3249
  29. 1225
  30. 9025
  31. 3844
  32. 7921
  33. 5476
  34. 1369
  35. 9604
  36. 2401
  37. 5329
  38. 1681
  39. 9409
  40. 961

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