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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 782 · 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. 1.69² =
  2. 2.69² =
  3. 3.21² =
  4. 4.59² =
  5. 5.31² =
  6. 6.59² =
  7. 7.71² =
  8. 8.29² =
  9. 9.39² =
  10. 10.39² =
  11. 11.39² =
  12. 12.19² =
  13. 13.79² =
  14. 14.21² =
  15. 15.61² =
  16. 16.41² =
  17. 17.31² =
  18. 18.49² =
  19. 19.91² =
  20. 20.81² =
  21. 21.81² =
  22. 22.29² =
  23. 23.91² =
  24. 24.71² =
  25. 25.71² =
  26. 26.79² =
  27. 27.51² =
  28. 28.89² =
  29. 29.29² =
  30. 30.19² =
  31. 31.31² =
  32. 32.49² =
  33. 33.91² =
  34. 34.41² =
  35. 35.69² =
  36. 36.19² =
  37. 37.49² =
  38. 38.59² =
  39. 39.39² =
  40. 40.89² =

Answer key

  1. 4761
  2. 4761
  3. 441
  4. 3481
  5. 961
  6. 3481
  7. 5041
  8. 841
  9. 1521
  10. 1521
  11. 1521
  12. 361
  13. 6241
  14. 441
  15. 3721
  16. 1681
  17. 961
  18. 2401
  19. 8281
  20. 6561
  21. 6561
  22. 841
  23. 8281
  24. 5041
  25. 5041
  26. 6241
  27. 2601
  28. 7921
  29. 841
  30. 361
  31. 961
  32. 2401
  33. 8281
  34. 1681
  35. 4761
  36. 361
  37. 2401
  38. 3481
  39. 1521
  40. 7921

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