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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 222 · 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. 1.81² =
  2. 2.59² =
  3. 3.59² =
  4. 4.61² =
  5. 5.61² =
  6. 6.91² =
  7. 7.39² =
  8. 8.39² =
  9. 9.61² =
  10. 10.19² =
  11. 11.91² =
  12. 12.81² =
  13. 13.29² =
  14. 14.91² =
  15. 15.89² =
  16. 16.59² =
  17. 17.89² =
  18. 18.79² =
  19. 19.51² =
  20. 20.21² =
  21. 21.89² =
  22. 22.49² =
  23. 23.19² =
  24. 24.49² =
  25. 25.91² =
  26. 26.41² =
  27. 27.81² =
  28. 28.29² =
  29. 29.29² =
  30. 30.51² =
  31. 31.89² =
  32. 32.81² =
  33. 33.71² =
  34. 34.91² =
  35. 35.89² =
  36. 36.19² =
  37. 37.59² =
  38. 38.21² =
  39. 39.39² =
  40. 40.21² =

Answer key

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

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