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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 320 · 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. 1.41² =
  2. 2.69² =
  3. 3.79² =
  4. 4.49² =
  5. 5.81² =
  6. 6.31² =
  7. 7.39² =
  8. 8.59² =
  9. 9.81² =
  10. 10.69² =
  11. 11.61² =
  12. 12.69² =
  13. 13.69² =
  14. 14.71² =
  15. 15.89² =
  16. 16.89² =
  17. 17.69² =
  18. 18.21² =
  19. 19.81² =
  20. 20.19² =
  21. 21.19² =
  22. 22.69² =
  23. 23.29² =
  24. 24.59² =
  25. 25.79² =
  26. 26.61² =
  27. 27.19² =
  28. 28.79² =
  29. 29.89² =
  30. 30.91² =
  31. 31.69² =
  32. 32.21² =
  33. 33.71² =
  34. 34.39² =
  35. 35.21² =
  36. 36.69² =
  37. 37.41² =
  38. 38.21² =
  39. 39.31² =
  40. 40.91² =

Answer key

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

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