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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 343 · 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. 1.86² =
  2. 2.83² =
  3. 3.65² =
  4. 4.66² =
  5. 5.97² =
  6. 6.82² =
  7. 7.35² =
  8. 8.45² =
  9. 9.79² =
  10. 10.48² =
  11. 11.59² =
  12. 12.44² =
  13. 13.91² =
  14. 14.33² =
  15. 15.41² =
  16. 16.99² =
  17. 17.72² =
  18. 18.87² =
  19. 19.37² =
  20. 20.71² =
  21. 21.76² =
  22. 22.94² =
  23. 23.81² =
  24. 24.47² =
  25. 25.67² =
  26. 26.54² =
  27. 27.52² =
  28. 28.46² =
  29. 29.43² =
  30. 30.85² =
  31. 31.92² =
  32. 32.78² =
  33. 33.56² =
  34. 34.93² =
  35. 35.95² =
  36. 36.32² =
  37. 37.57² =
  38. 38.64² =
  39. 39.96² =
  40. 40.31² =

Answer key

  1. 7396
  2. 6889
  3. 4225
  4. 4356
  5. 9409
  6. 6724
  7. 1225
  8. 2025
  9. 6241
  10. 2304
  11. 3481
  12. 1936
  13. 8281
  14. 1089
  15. 1681
  16. 9801
  17. 5184
  18. 7569
  19. 1369
  20. 5041
  21. 5776
  22. 8836
  23. 6561
  24. 2209
  25. 4489
  26. 2916
  27. 2704
  28. 2116
  29. 1849
  30. 7225
  31. 8464
  32. 6084
  33. 3136
  34. 8649
  35. 9025
  36. 1024
  37. 3249
  38. 4096
  39. 9216
  40. 961

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