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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 778 · 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. 1.45² =
  2. 2.42² =
  3. 3.83² =
  4. 4.61² =
  5. 5.81² =
  6. 6.82² =
  7. 7.71² =
  8. 8.67² =
  9. 9.36² =
  10. 10.52² =
  11. 11.41² =
  12. 12.98² =
  13. 13.73² =
  14. 14.51² =
  15. 15.86² =
  16. 16.97² =
  17. 17.91² =
  18. 18.62² =
  19. 19.93² =
  20. 20.68² =
  21. 21.78² =
  22. 22.84² =
  23. 23.37² =
  24. 24.34² =
  25. 25.64² =
  26. 26.56² =
  27. 27.77² =
  28. 28.47² =
  29. 29.38² =
  30. 30.48² =
  31. 31.49² =
  32. 32.92² =
  33. 33.75² =
  34. 34.31² =
  35. 35.66² =
  36. 36.46² =
  37. 37.43² =
  38. 38.69² =
  39. 39.32² =
  40. 40.89² =

Answer key

  1. 2025
  2. 1764
  3. 6889
  4. 3721
  5. 6561
  6. 6724
  7. 5041
  8. 4489
  9. 1296
  10. 2704
  11. 1681
  12. 9604
  13. 5329
  14. 2601
  15. 7396
  16. 9409
  17. 8281
  18. 3844
  19. 8649
  20. 4624
  21. 6084
  22. 7056
  23. 1369
  24. 1156
  25. 4096
  26. 3136
  27. 5929
  28. 2209
  29. 1444
  30. 2304
  31. 2401
  32. 8464
  33. 5625
  34. 961
  35. 4356
  36. 2116
  37. 1849
  38. 4761
  39. 1024
  40. 7921

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