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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 63 · 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. 1.97² =
  2. 2.78² =
  3. 3.63² =
  4. 4.76² =
  5. 5.61² =
  6. 6.44² =
  7. 7.98² =
  8. 8.45² =
  9. 9.64² =
  10. 10.91² =
  11. 11.36² =
  12. 12.41² =
  13. 13.89² =
  14. 14.72² =
  15. 15.73² =
  16. 16.49² =
  17. 17.75² =
  18. 18.43² =
  19. 19.47² =
  20. 20.67² =
  21. 21.88² =
  22. 22.52² =
  23. 23.81² =
  24. 24.66² =
  25. 25.31² =
  26. 26.86² =
  27. 27.35² =
  28. 28.54² =
  29. 29.62² =
  30. 30.48² =
  31. 31.39² =
  32. 32.99² =
  33. 33.42² =
  34. 34.46² =
  35. 35.37² =
  36. 36.87² =
  37. 37.94² =
  38. 38.53² =
  39. 39.69² =
  40. 40.71² =

Answer key

  1. 9409
  2. 6084
  3. 3969
  4. 5776
  5. 3721
  6. 1936
  7. 9604
  8. 2025
  9. 4096
  10. 8281
  11. 1296
  12. 1681
  13. 7921
  14. 5184
  15. 5329
  16. 2401
  17. 5625
  18. 1849
  19. 2209
  20. 4489
  21. 7744
  22. 2704
  23. 6561
  24. 4356
  25. 961
  26. 7396
  27. 1225
  28. 2916
  29. 3844
  30. 2304
  31. 1521
  32. 9801
  33. 1764
  34. 2116
  35. 1369
  36. 7569
  37. 8836
  38. 2809
  39. 4761
  40. 5041

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