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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 601 · 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. 1.61² =
  2. 2.79² =
  3. 3.81² =
  4. 4.79² =
  5. 5.71² =
  6. 6.31² =
  7. 7.29² =
  8. 8.29² =
  9. 9.61² =
  10. 10.89² =
  11. 11.29² =
  12. 12.31² =
  13. 13.39² =
  14. 14.89² =
  15. 15.81² =
  16. 16.29² =
  17. 17.49² =
  18. 18.91² =
  19. 19.19² =
  20. 20.79² =
  21. 21.79² =
  22. 22.51² =
  23. 23.71² =
  24. 24.89² =
  25. 25.69² =
  26. 26.19² =
  27. 27.19² =
  28. 28.71² =
  29. 29.49² =
  30. 30.79² =
  31. 31.29² =
  32. 32.59² =
  33. 33.39² =
  34. 34.21² =
  35. 35.69² =
  36. 36.21² =
  37. 37.19² =
  38. 38.71² =
  39. 39.81² =
  40. 40.79² =

Answer key

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

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