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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 730 · 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. 1.29² =
  2. 2.31² =
  3. 3.69² =
  4. 4.69² =
  5. 5.29² =
  6. 6.61² =
  7. 7.41² =
  8. 8.29² =
  9. 9.49² =
  10. 10.79² =
  11. 11.89² =
  12. 12.41² =
  13. 13.39² =
  14. 14.61² =
  15. 15.89² =
  16. 16.59² =
  17. 17.79² =
  18. 18.21² =
  19. 19.39² =
  20. 20.29² =
  21. 21.31² =
  22. 22.69² =
  23. 23.59² =
  24. 24.59² =
  25. 25.91² =
  26. 26.69² =
  27. 27.49² =
  28. 28.69² =
  29. 29.69² =
  30. 30.61² =
  31. 31.91² =
  32. 32.91² =
  33. 33.89² =
  34. 34.71² =
  35. 35.69² =
  36. 36.49² =
  37. 37.81² =
  38. 38.71² =
  39. 39.39² =
  40. 40.79² =

Answer key

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

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