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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 438 · 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. 1.65² =
  2. 2.42² =
  3. 3.47² =
  4. 4.48² =
  5. 5.94² =
  6. 6.97² =
  7. 7.34² =
  8. 8.41² =
  9. 9.44² =
  10. 10.46² =
  11. 11.62² =
  12. 12.78² =
  13. 13.92² =
  14. 14.31² =
  15. 15.71² =
  16. 16.93² =
  17. 17.61² =
  18. 18.99² =
  19. 19.36² =
  20. 20.91² =
  21. 21.98² =
  22. 22.89² =
  23. 23.54² =
  24. 24.74² =
  25. 25.55² =
  26. 26.33² =
  27. 27.59² =
  28. 28.52² =
  29. 29.56² =
  30. 30.49² =
  31. 31.51² =
  32. 32.66² =
  33. 33.39² =
  34. 34.72² =
  35. 35.79² =
  36. 36.95² =
  37. 37.32² =
  38. 38.96² =
  39. 39.81² =
  40. 40.85² =

Answer key

  1. 4225
  2. 1764
  3. 2209
  4. 2304
  5. 8836
  6. 9409
  7. 1156
  8. 1681
  9. 1936
  10. 2116
  11. 3844
  12. 6084
  13. 8464
  14. 961
  15. 5041
  16. 8649
  17. 3721
  18. 9801
  19. 1296
  20. 8281
  21. 9604
  22. 7921
  23. 2916
  24. 5476
  25. 3025
  26. 1089
  27. 3481
  28. 2704
  29. 3136
  30. 2401
  31. 2601
  32. 4356
  33. 1521
  34. 5184
  35. 6241
  36. 9025
  37. 1024
  38. 9216
  39. 6561
  40. 7225

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