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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 149 · 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. 1.61² =
  2. 2.69² =
  3. 3.69² =
  4. 4.69² =
  5. 5.69² =
  6. 6.51² =
  7. 7.39² =
  8. 8.61² =
  9. 9.71² =
  10. 10.59² =
  11. 11.21² =
  12. 12.29² =
  13. 13.39² =
  14. 14.31² =
  15. 15.59² =
  16. 16.51² =
  17. 17.41² =
  18. 18.51² =
  19. 19.91² =
  20. 20.71² =
  21. 21.41² =
  22. 22.71² =
  23. 23.51² =
  24. 24.41² =
  25. 25.41² =
  26. 26.49² =
  27. 27.49² =
  28. 28.19² =
  29. 29.39² =
  30. 30.61² =
  31. 31.51² =
  32. 32.71² =
  33. 33.29² =
  34. 34.29² =
  35. 35.89² =
  36. 36.59² =
  37. 37.31² =
  38. 38.19² =
  39. 39.81² =
  40. 40.21² =

Answer key

  1. 3721
  2. 4761
  3. 4761
  4. 4761
  5. 4761
  6. 2601
  7. 1521
  8. 3721
  9. 5041
  10. 3481
  11. 441
  12. 841
  13. 1521
  14. 961
  15. 3481
  16. 2601
  17. 1681
  18. 2601
  19. 8281
  20. 5041
  21. 1681
  22. 5041
  23. 2601
  24. 1681
  25. 1681
  26. 2401
  27. 2401
  28. 361
  29. 1521
  30. 3721
  31. 2601
  32. 5041
  33. 841
  34. 841
  35. 7921
  36. 3481
  37. 961
  38. 361
  39. 6561
  40. 441

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