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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 55 · 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. 1.98² =
  2. 2.54² =
  3. 3.46² =
  4. 4.47² =
  5. 5.65² =
  6. 6.49² =
  7. 7.33² =
  8. 8.68² =
  9. 9.35² =
  10. 10.32² =
  11. 11.84² =
  12. 12.92² =
  13. 13.38² =
  14. 14.41² =
  15. 15.66² =
  16. 16.79² =
  17. 17.61² =
  18. 18.95² =
  19. 19.91² =
  20. 20.58² =
  21. 21.71² =
  22. 22.48² =
  23. 23.72² =
  24. 24.52² =
  25. 25.97² =
  26. 26.81² =
  27. 27.96² =
  28. 28.31² =
  29. 29.39² =
  30. 30.76² =
  31. 31.74² =
  32. 32.89² =
  33. 33.57² =
  34. 34.86² =
  35. 35.45² =
  36. 36.99² =
  37. 37.36² =
  38. 38.77² =
  39. 39.53² =
  40. 40.83² =

Answer key

  1. 9604
  2. 2916
  3. 2116
  4. 2209
  5. 4225
  6. 2401
  7. 1089
  8. 4624
  9. 1225
  10. 1024
  11. 7056
  12. 8464
  13. 1444
  14. 1681
  15. 4356
  16. 6241
  17. 3721
  18. 9025
  19. 8281
  20. 3364
  21. 5041
  22. 2304
  23. 5184
  24. 2704
  25. 9409
  26. 6561
  27. 9216
  28. 961
  29. 1521
  30. 5776
  31. 5476
  32. 7921
  33. 3249
  34. 7396
  35. 2025
  36. 9801
  37. 1296
  38. 5929
  39. 2809
  40. 6889

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