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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 372 · 40 questions
TalentJR

The fast method (Step from a neighbour): Find the round neighbour and square it: 70² = 7 × 7 = 49, then two 0s → 4900. Ends in 1 (one more)? Add the round number and the number: 4900 + 70 + 71. Ends in 9 (one less)? Take them away: 69² = 4900 − 70 − 69 = 4761.

NameDateTime takenScore ___ / 40
  1. 1.29² =
  2. 2.71² =
  3. 3.51² =
  4. 4.61² =
  5. 5.61² =
  6. 6.21² =
  7. 7.39² =
  8. 8.91² =
  9. 9.39² =
  10. 10.21² =
  11. 11.79² =
  12. 12.29² =
  13. 13.21² =
  14. 14.59² =
  15. 15.41² =
  16. 16.71² =
  17. 17.71² =
  18. 18.51² =
  19. 19.19² =
  20. 20.69² =
  21. 21.31² =
  22. 22.69² =
  23. 23.49² =
  24. 24.79² =
  25. 25.39² =
  26. 26.81² =
  27. 27.41² =
  28. 28.49² =
  29. 29.41² =
  30. 30.31² =
  31. 31.59² =
  32. 32.59² =
  33. 33.19² =
  34. 34.39² =
  35. 35.31² =
  36. 36.49² =
  37. 37.71² =
  38. 38.39² =
  39. 39.19² =
  40. 40.19² =

Answer key

  1. 841
  2. 5041
  3. 2601
  4. 3721
  5. 3721
  6. 441
  7. 1521
  8. 8281
  9. 1521
  10. 441
  11. 6241
  12. 841
  13. 441
  14. 3481
  15. 1681
  16. 5041
  17. 5041
  18. 2601
  19. 361
  20. 4761
  21. 961
  22. 4761
  23. 2401
  24. 6241
  25. 1521
  26. 6561
  27. 1681
  28. 2401
  29. 1681
  30. 961
  31. 3481
  32. 3481
  33. 361
  34. 1521
  35. 961
  36. 2401
  37. 5041
  38. 1521
  39. 361
  40. 361

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