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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 763 · 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. 1.71² =
  2. 2.93² =
  3. 3.99² =
  4. 4.66² =
  5. 5.67² =
  6. 6.41² =
  7. 7.91² =
  8. 8.36² =
  9. 9.54² =
  10. 10.39² =
  11. 11.47² =
  12. 12.53² =
  13. 13.69² =
  14. 14.43² =
  15. 15.87² =
  16. 16.85² =
  17. 17.94² =
  18. 18.74² =
  19. 19.97² =
  20. 20.57² =
  21. 21.45² =
  22. 22.81² =
  23. 23.77² =
  24. 24.72² =
  25. 25.98² =
  26. 26.48² =
  27. 27.59² =
  28. 28.31² =
  29. 29.46² =
  30. 30.52² =
  31. 31.73² =
  32. 32.32² =
  33. 33.82² =
  34. 34.37² =
  35. 35.65² =
  36. 36.33² =
  37. 37.51² =
  38. 38.61² =
  39. 39.55² =
  40. 40.64² =

Answer key

  1. 5041
  2. 8649
  3. 9801
  4. 4356
  5. 4489
  6. 1681
  7. 8281
  8. 1296
  9. 2916
  10. 1521
  11. 2209
  12. 2809
  13. 4761
  14. 1849
  15. 7569
  16. 7225
  17. 8836
  18. 5476
  19. 9409
  20. 3249
  21. 2025
  22. 6561
  23. 5929
  24. 5184
  25. 9604
  26. 2304
  27. 3481
  28. 961
  29. 2116
  30. 2704
  31. 5329
  32. 1024
  33. 6724
  34. 1369
  35. 4225
  36. 1089
  37. 2601
  38. 3721
  39. 3025
  40. 4096

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