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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 158 · 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. 1.61² =
  2. 2.88² =
  3. 3.56² =
  4. 4.41² =
  5. 5.92² =
  6. 6.55² =
  7. 7.95² =
  8. 8.97² =
  9. 9.42² =
  10. 10.47² =
  11. 11.36² =
  12. 12.32² =
  13. 13.51² =
  14. 14.91² =
  15. 15.74² =
  16. 16.83² =
  17. 17.69² =
  18. 18.85² =
  19. 19.45² =
  20. 20.48² =
  21. 21.58² =
  22. 22.38² =
  23. 23.87² =
  24. 24.37² =
  25. 25.99² =
  26. 26.96² =
  27. 27.94² =
  28. 28.98² =
  29. 29.59² =
  30. 30.71² =
  31. 31.33² =
  32. 32.39² =
  33. 33.46² =
  34. 34.68² =
  35. 35.49² =
  36. 36.54² =
  37. 37.44² =
  38. 38.89² =
  39. 39.63² =
  40. 40.66² =

Answer key

  1. 3721
  2. 7744
  3. 3136
  4. 1681
  5. 8464
  6. 3025
  7. 9025
  8. 9409
  9. 1764
  10. 2209
  11. 1296
  12. 1024
  13. 2601
  14. 8281
  15. 5476
  16. 6889
  17. 4761
  18. 7225
  19. 2025
  20. 2304
  21. 3364
  22. 1444
  23. 7569
  24. 1369
  25. 9801
  26. 9216
  27. 8836
  28. 9604
  29. 3481
  30. 5041
  31. 1089
  32. 1521
  33. 2116
  34. 4624
  35. 2401
  36. 2916
  37. 1936
  38. 7921
  39. 3969
  40. 4356

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