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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 74 · 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. 1.72² =
  2. 2.32² =
  3. 3.58² =
  4. 4.47² =
  5. 5.96² =
  6. 6.76² =
  7. 7.64² =
  8. 8.53² =
  9. 9.55² =
  10. 10.49² =
  11. 11.67² =
  12. 12.54² =
  13. 13.91² =
  14. 14.81² =
  15. 15.56² =
  16. 16.38² =
  17. 17.41² =
  18. 18.51² =
  19. 19.46² =
  20. 20.61² =
  21. 21.39² =
  22. 22.69² =
  23. 23.75² =
  24. 24.78² =
  25. 25.79² =
  26. 26.43² =
  27. 27.89² =
  28. 28.99² =
  29. 29.45² =
  30. 30.31² =
  31. 31.97² =
  32. 32.73² =
  33. 33.88² =
  34. 34.35² =
  35. 35.98² =
  36. 36.87² =
  37. 37.77² =
  38. 38.83² =
  39. 39.66² =
  40. 40.48² =

Answer key

  1. 5184
  2. 1024
  3. 3364
  4. 2209
  5. 9216
  6. 5776
  7. 4096
  8. 2809
  9. 3025
  10. 2401
  11. 4489
  12. 2916
  13. 8281
  14. 6561
  15. 3136
  16. 1444
  17. 1681
  18. 2601
  19. 2116
  20. 3721
  21. 1521
  22. 4761
  23. 5625
  24. 6084
  25. 6241
  26. 1849
  27. 7921
  28. 9801
  29. 2025
  30. 961
  31. 9409
  32. 5329
  33. 7744
  34. 1225
  35. 9604
  36. 7569
  37. 5929
  38. 6889
  39. 4356
  40. 2304

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