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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 567 · 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. 1.41² =
  2. 2.43² =
  3. 3.54² =
  4. 4.52² =
  5. 5.73² =
  6. 6.38² =
  7. 7.63² =
  8. 8.66² =
  9. 9.78² =
  10. 10.71² =
  11. 11.33² =
  12. 12.64² =
  13. 13.61² =
  14. 14.51² =
  15. 15.68² =
  16. 16.47² =
  17. 17.31² =
  18. 18.98² =
  19. 19.37² =
  20. 20.34² =
  21. 21.74² =
  22. 22.89² =
  23. 23.77² =
  24. 24.49² =
  25. 25.92² =
  26. 26.87² =
  27. 27.48² =
  28. 28.69² =
  29. 29.79² =
  30. 30.42² =
  31. 31.99² =
  32. 32.62² =
  33. 33.45² =
  34. 34.53² =
  35. 35.59² =
  36. 36.88² =
  37. 37.95² =
  38. 38.84² =
  39. 39.46² =
  40. 40.76² =

Answer key

  1. 1681
  2. 1849
  3. 2916
  4. 2704
  5. 5329
  6. 1444
  7. 3969
  8. 4356
  9. 6084
  10. 5041
  11. 1089
  12. 4096
  13. 3721
  14. 2601
  15. 4624
  16. 2209
  17. 961
  18. 9604
  19. 1369
  20. 1156
  21. 5476
  22. 7921
  23. 5929
  24. 2401
  25. 8464
  26. 7569
  27. 2304
  28. 4761
  29. 6241
  30. 1764
  31. 9801
  32. 3844
  33. 2025
  34. 2809
  35. 3481
  36. 7744
  37. 9025
  38. 7056
  39. 2116
  40. 5776

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