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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 61 · 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. 1.21² =
  2. 2.69² =
  3. 3.71² =
  4. 4.39² =
  5. 5.21² =
  6. 6.19² =
  7. 7.89² =
  8. 8.71² =
  9. 9.79² =
  10. 10.41² =
  11. 11.89² =
  12. 12.71² =
  13. 13.39² =
  14. 14.89² =
  15. 15.29² =
  16. 16.61² =
  17. 17.81² =
  18. 18.59² =
  19. 19.31² =
  20. 20.69² =
  21. 21.31² =
  22. 22.21² =
  23. 23.19² =
  24. 24.79² =
  25. 25.89² =
  26. 26.41² =
  27. 27.89² =
  28. 28.59² =
  29. 29.21² =
  30. 30.31² =
  31. 31.59² =
  32. 32.61² =
  33. 33.31² =
  34. 34.69² =
  35. 35.41² =
  36. 36.79² =
  37. 37.21² =
  38. 38.81² =
  39. 39.19² =
  40. 40.21² =

Answer key

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

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