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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 165 · 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. 1.89² =
  2. 2.79² =
  3. 3.29² =
  4. 4.39² =
  5. 5.91² =
  6. 6.71² =
  7. 7.89² =
  8. 8.41² =
  9. 9.91² =
  10. 10.69² =
  11. 11.29² =
  12. 12.41² =
  13. 13.21² =
  14. 14.91² =
  15. 15.49² =
  16. 16.89² =
  17. 17.29² =
  18. 18.79² =
  19. 19.59² =
  20. 20.39² =
  21. 21.59² =
  22. 22.41² =
  23. 23.49² =
  24. 24.21² =
  25. 25.19² =
  26. 26.21² =
  27. 27.59² =
  28. 28.29² =
  29. 29.39² =
  30. 30.61² =
  31. 31.29² =
  32. 32.49² =
  33. 33.19² =
  34. 34.21² =
  35. 35.79² =
  36. 36.61² =
  37. 37.31² =
  38. 38.61² =
  39. 39.39² =
  40. 40.29² =

Answer key

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

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