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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 276 · 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. 1.71² =
  2. 2.59² =
  3. 3.71² =
  4. 4.89² =
  5. 5.39² =
  6. 6.81² =
  7. 7.89² =
  8. 8.21² =
  9. 9.41² =
  10. 10.69² =
  11. 11.79² =
  12. 12.81² =
  13. 13.71² =
  14. 14.39² =
  15. 15.49² =
  16. 16.41² =
  17. 17.59² =
  18. 18.31² =
  19. 19.49² =
  20. 20.31² =
  21. 21.71² =
  22. 22.61² =
  23. 23.61² =
  24. 24.81² =
  25. 25.79² =
  26. 26.89² =
  27. 27.29² =
  28. 28.39² =
  29. 29.49² =
  30. 30.29² =
  31. 31.59² =
  32. 32.19² =
  33. 33.81² =
  34. 34.39² =
  35. 35.69² =
  36. 36.81² =
  37. 37.71² =
  38. 38.69² =
  39. 39.51² =
  40. 40.89² =

Answer key

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

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