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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 685 · 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. 1.19² =
  2. 2.19² =
  3. 3.21² =
  4. 4.29² =
  5. 5.91² =
  6. 6.59² =
  7. 7.69² =
  8. 8.79² =
  9. 9.41² =
  10. 10.29² =
  11. 11.71² =
  12. 12.59² =
  13. 13.19² =
  14. 14.81² =
  15. 15.89² =
  16. 16.19² =
  17. 17.71² =
  18. 18.89² =
  19. 19.59² =
  20. 20.39² =
  21. 21.39² =
  22. 22.49² =
  23. 23.31² =
  24. 24.91² =
  25. 25.21² =
  26. 26.81² =
  27. 27.61² =
  28. 28.29² =
  29. 29.19² =
  30. 30.29² =
  31. 31.41² =
  32. 32.71² =
  33. 33.61² =
  34. 34.19² =
  35. 35.89² =
  36. 36.61² =
  37. 37.51² =
  38. 38.19² =
  39. 39.89² =
  40. 40.61² =

Answer key

  1. 361
  2. 361
  3. 441
  4. 841
  5. 8281
  6. 3481
  7. 4761
  8. 6241
  9. 1681
  10. 841
  11. 5041
  12. 3481
  13. 361
  14. 6561
  15. 7921
  16. 361
  17. 5041
  18. 7921
  19. 3481
  20. 1521
  21. 1521
  22. 2401
  23. 961
  24. 8281
  25. 441
  26. 6561
  27. 3721
  28. 841
  29. 361
  30. 841
  31. 1681
  32. 5041
  33. 3721
  34. 361
  35. 7921
  36. 3721
  37. 2601
  38. 361
  39. 7921
  40. 3721

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