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Squaring 2-Digit Numbers Mentally Worksheet

Mental maths lesson 23: Square any 2-digit number: up and down · Set 949 · 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. 1.75² =
  2. 2.98² =
  3. 3.71² =
  4. 4.69² =
  5. 5.86² =
  6. 6.48² =
  7. 7.67² =
  8. 8.36² =
  9. 9.91² =
  10. 10.95² =
  11. 11.85² =
  12. 12.51² =
  13. 13.66² =
  14. 14.53² =
  15. 15.89² =
  16. 16.81² =
  17. 17.34² =
  18. 18.76² =
  19. 19.45² =
  20. 20.37² =
  21. 21.84² =
  22. 22.97² =
  23. 23.44² =
  24. 24.56² =
  25. 25.88² =
  26. 26.82² =
  27. 27.49² =
  28. 28.47² =
  29. 29.57² =
  30. 30.41² =
  31. 31.94² =
  32. 32.65² =
  33. 33.72² =
  34. 34.61² =
  35. 35.74² =
  36. 36.59² =
  37. 37.73² =
  38. 38.32² =
  39. 39.78² =
  40. 40.46² =

Answer key

  1. 5625
  2. 9604
  3. 5041
  4. 4761
  5. 7396
  6. 2304
  7. 4489
  8. 1296
  9. 8281
  10. 9025
  11. 7225
  12. 2601
  13. 4356
  14. 2809
  15. 7921
  16. 6561
  17. 1156
  18. 5776
  19. 2025
  20. 1369
  21. 7056
  22. 9409
  23. 1936
  24. 3136
  25. 7744
  26. 6724
  27. 2401
  28. 2209
  29. 3249
  30. 1681
  31. 8836
  32. 4225
  33. 5184
  34. 3721
  35. 5476
  36. 3481
  37. 5329
  38. 1024
  39. 6084
  40. 2116

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