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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 536 · 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. 1.46² =
  2. 2.42² =
  3. 3.65² =
  4. 4.83² =
  5. 5.36² =
  6. 6.72² =
  7. 7.61² =
  8. 8.51² =
  9. 9.91² =
  10. 10.59² =
  11. 11.32² =
  12. 12.92² =
  13. 13.78² =
  14. 14.69² =
  15. 15.39² =
  16. 16.85² =
  17. 17.99² =
  18. 18.84² =
  19. 19.63² =
  20. 20.98² =
  21. 21.54² =
  22. 22.95² =
  23. 23.71² =
  24. 24.96² =
  25. 25.89² =
  26. 26.97² =
  27. 27.47² =
  28. 28.52² =
  29. 29.74² =
  30. 30.41² =
  31. 31.75² =
  32. 32.33² =
  33. 33.48² =
  34. 34.56² =
  35. 35.38² =
  36. 36.93² =
  37. 37.94² =
  38. 38.58² =
  39. 39.79² =
  40. 40.81² =

Answer key

  1. 2116
  2. 1764
  3. 4225
  4. 6889
  5. 1296
  6. 5184
  7. 3721
  8. 2601
  9. 8281
  10. 3481
  11. 1024
  12. 8464
  13. 6084
  14. 4761
  15. 1521
  16. 7225
  17. 9801
  18. 7056
  19. 3969
  20. 9604
  21. 2916
  22. 9025
  23. 5041
  24. 9216
  25. 7921
  26. 9409
  27. 2209
  28. 2704
  29. 5476
  30. 1681
  31. 5625
  32. 1089
  33. 2304
  34. 3136
  35. 1444
  36. 8649
  37. 8836
  38. 3364
  39. 6241
  40. 6561

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