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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 800 · 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. 2.19² =
  3. 3.69² =
  4. 4.61² =
  5. 5.71² =
  6. 6.31² =
  7. 7.51² =
  8. 8.69² =
  9. 9.19² =
  10. 10.49² =
  11. 11.51² =
  12. 12.79² =
  13. 13.81² =
  14. 14.29² =
  15. 15.91² =
  16. 16.39² =
  17. 17.31² =
  18. 18.91² =
  19. 19.81² =
  20. 20.69² =
  21. 21.91² =
  22. 22.89² =
  23. 23.29² =
  24. 24.21² =
  25. 25.81² =
  26. 26.61² =
  27. 27.71² =
  28. 28.81² =
  29. 29.69² =
  30. 30.19² =
  31. 31.29² =
  32. 32.39² =
  33. 33.21² =
  34. 34.21² =
  35. 35.59² =
  36. 36.59² =
  37. 37.69² =
  38. 38.21² =
  39. 39.89² =
  40. 40.29² =

Answer key

  1. 1521
  2. 361
  3. 4761
  4. 3721
  5. 5041
  6. 961
  7. 2601
  8. 4761
  9. 361
  10. 2401
  11. 2601
  12. 6241
  13. 6561
  14. 841
  15. 8281
  16. 1521
  17. 961
  18. 8281
  19. 6561
  20. 4761
  21. 8281
  22. 7921
  23. 841
  24. 441
  25. 6561
  26. 3721
  27. 5041
  28. 6561
  29. 4761
  30. 361
  31. 841
  32. 1521
  33. 441
  34. 441
  35. 3481
  36. 3481
  37. 4761
  38. 441
  39. 7921
  40. 841

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