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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 111 · 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. 1.79² =
  2. 2.71² =
  3. 3.61² =
  4. 4.31² =
  5. 5.29² =
  6. 6.89² =
  7. 7.91² =
  8. 8.59² =
  9. 9.61² =
  10. 10.31² =
  11. 11.59² =
  12. 12.71² =
  13. 13.39² =
  14. 14.39² =
  15. 15.29² =
  16. 16.49² =
  17. 17.29² =
  18. 18.39² =
  19. 19.69² =
  20. 20.21² =
  21. 21.59² =
  22. 22.69² =
  23. 23.91² =
  24. 24.49² =
  25. 25.71² =
  26. 26.41² =
  27. 27.29² =
  28. 28.61² =
  29. 29.21² =
  30. 30.69² =
  31. 31.31² =
  32. 32.71² =
  33. 33.21² =
  34. 34.61² =
  35. 35.31² =
  36. 36.71² =
  37. 37.31² =
  38. 38.61² =
  39. 39.41² =
  40. 40.81² =

Answer key

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

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