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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 738 · 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. 2.79² =
  3. 3.79² =
  4. 4.41² =
  5. 5.61² =
  6. 6.59² =
  7. 7.39² =
  8. 8.19² =
  9. 9.41² =
  10. 10.19² =
  11. 11.29² =
  12. 12.39² =
  13. 13.39² =
  14. 14.69² =
  15. 15.59² =
  16. 16.59² =
  17. 17.71² =
  18. 18.61² =
  19. 19.39² =
  20. 20.81² =
  21. 21.69² =
  22. 22.79² =
  23. 23.29² =
  24. 24.61² =
  25. 25.59² =
  26. 26.81² =
  27. 27.29² =
  28. 28.39² =
  29. 29.69² =
  30. 30.91² =
  31. 31.21² =
  32. 32.61² =
  33. 33.69² =
  34. 34.49² =
  35. 35.31² =
  36. 36.79² =
  37. 37.21² =
  38. 38.61² =
  39. 39.29² =
  40. 40.29² =

Answer key

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

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