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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 420 · 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. 1.75² =
  2. 2.35² =
  3. 3.61² =
  4. 4.38² =
  5. 5.99² =
  6. 6.49² =
  7. 7.37² =
  8. 8.63² =
  9. 9.84² =
  10. 10.64² =
  11. 11.36² =
  12. 12.95² =
  13. 13.73² =
  14. 14.66² =
  15. 15.71² =
  16. 16.89² =
  17. 17.67² =
  18. 18.33² =
  19. 19.31² =
  20. 20.81² =
  21. 21.32² =
  22. 22.97² =
  23. 23.76² =
  24. 24.98² =
  25. 25.51² =
  26. 26.79² =
  27. 27.53² =
  28. 28.93² =
  29. 29.43² =
  30. 30.62² =
  31. 31.34² =
  32. 32.45² =
  33. 33.47² =
  34. 34.52² =
  35. 35.58² =
  36. 36.48² =
  37. 37.74² =
  38. 38.41² =
  39. 39.91² =
  40. 40.88² =

Answer key

  1. 5625
  2. 1225
  3. 3721
  4. 1444
  5. 9801
  6. 2401
  7. 1369
  8. 3969
  9. 7056
  10. 4096
  11. 1296
  12. 9025
  13. 5329
  14. 4356
  15. 5041
  16. 7921
  17. 4489
  18. 1089
  19. 961
  20. 6561
  21. 1024
  22. 9409
  23. 5776
  24. 9604
  25. 2601
  26. 6241
  27. 2809
  28. 8649
  29. 1849
  30. 3844
  31. 1156
  32. 2025
  33. 2209
  34. 2704
  35. 3364
  36. 2304
  37. 5476
  38. 1681
  39. 8281
  40. 7744

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