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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 147 · 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. 1.39² =
  2. 2.59² =
  3. 3.39² =
  4. 4.69² =
  5. 5.39² =
  6. 6.71² =
  7. 7.21² =
  8. 8.19² =
  9. 9.41² =
  10. 10.31² =
  11. 11.31² =
  12. 12.21² =
  13. 13.91² =
  14. 14.79² =
  15. 15.39² =
  16. 16.79² =
  17. 17.91² =
  18. 18.29² =
  19. 19.71² =
  20. 20.39² =
  21. 21.39² =
  22. 22.81² =
  23. 23.39² =
  24. 24.41² =
  25. 25.29² =
  26. 26.31² =
  27. 27.19² =
  28. 28.19² =
  29. 29.21² =
  30. 30.19² =
  31. 31.31² =
  32. 32.49² =
  33. 33.29² =
  34. 34.61² =
  35. 35.29² =
  36. 36.39² =
  37. 37.29² =
  38. 38.59² =
  39. 39.89² =
  40. 40.21² =

Answer key

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

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