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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 5 · 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. 1.54² =
  2. 2.59² =
  3. 3.99² =
  4. 4.86² =
  5. 5.81² =
  6. 6.43² =
  7. 7.88² =
  8. 8.53² =
  9. 9.95² =
  10. 10.92² =
  11. 11.76² =
  12. 12.69² =
  13. 13.94² =
  14. 14.35² =
  15. 15.71² =
  16. 16.68² =
  17. 17.96² =
  18. 18.34² =
  19. 19.44² =
  20. 20.41² =
  21. 21.73² =
  22. 22.45² =
  23. 23.97² =
  24. 24.57² =
  25. 25.82² =
  26. 26.83² =
  27. 27.39² =
  28. 28.98² =
  29. 29.38² =
  30. 30.51² =
  31. 31.66² =
  32. 32.33² =
  33. 33.42² =
  34. 34.46² =
  35. 35.85² =
  36. 36.64² =
  37. 37.84² =
  38. 38.47² =
  39. 39.63² =
  40. 40.67² =

Answer key

  1. 2916
  2. 3481
  3. 9801
  4. 7396
  5. 6561
  6. 1849
  7. 7744
  8. 2809
  9. 9025
  10. 8464
  11. 5776
  12. 4761
  13. 8836
  14. 1225
  15. 5041
  16. 4624
  17. 9216
  18. 1156
  19. 1936
  20. 1681
  21. 5329
  22. 2025
  23. 9409
  24. 3249
  25. 6724
  26. 6889
  27. 1521
  28. 9604
  29. 1444
  30. 2601
  31. 4356
  32. 1089
  33. 1764
  34. 2116
  35. 7225
  36. 4096
  37. 7056
  38. 2209
  39. 3969
  40. 4489

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