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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 607 · 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. 1.62² =
  2. 2.51² =
  3. 3.95² =
  4. 4.46² =
  5. 5.45² =
  6. 6.39² =
  7. 7.72² =
  8. 8.35² =
  9. 9.82² =
  10. 10.36² =
  11. 11.92² =
  12. 12.44² =
  13. 13.81² =
  14. 14.55² =
  15. 15.96² =
  16. 16.98² =
  17. 17.34² =
  18. 18.56² =
  19. 19.52² =
  20. 20.77² =
  21. 21.58² =
  22. 22.47² =
  23. 23.74² =
  24. 24.54² =
  25. 25.33² =
  26. 26.48² =
  27. 27.88² =
  28. 28.99² =
  29. 29.84² =
  30. 30.43² =
  31. 31.79² =
  32. 32.91² =
  33. 33.65² =
  34. 34.66² =
  35. 35.93² =
  36. 36.64² =
  37. 37.32² =
  38. 38.94² =
  39. 39.71² =
  40. 40.86² =

Answer key

  1. 3844
  2. 2601
  3. 9025
  4. 2116
  5. 2025
  6. 1521
  7. 5184
  8. 1225
  9. 6724
  10. 1296
  11. 8464
  12. 1936
  13. 6561
  14. 3025
  15. 9216
  16. 9604
  17. 1156
  18. 3136
  19. 2704
  20. 5929
  21. 3364
  22. 2209
  23. 5476
  24. 2916
  25. 1089
  26. 2304
  27. 7744
  28. 9801
  29. 7056
  30. 1849
  31. 6241
  32. 8281
  33. 4225
  34. 4356
  35. 8649
  36. 4096
  37. 1024
  38. 8836
  39. 5041
  40. 7396

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