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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 726 · 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. 3.21² =
  4. 4.41² =
  5. 5.89² =
  6. 6.29² =
  7. 7.69² =
  8. 8.29² =
  9. 9.91² =
  10. 10.69² =
  11. 11.41² =
  12. 12.79² =
  13. 13.71² =
  14. 14.89² =
  15. 15.31² =
  16. 16.91² =
  17. 17.71² =
  18. 18.81² =
  19. 19.29² =
  20. 20.39² =
  21. 21.71² =
  22. 22.79² =
  23. 23.89² =
  24. 24.49² =
  25. 25.61² =
  26. 26.69² =
  27. 27.79² =
  28. 28.71² =
  29. 29.39² =
  30. 30.51² =
  31. 31.61² =
  32. 32.81² =
  33. 33.69² =
  34. 34.81² =
  35. 35.89² =
  36. 36.39² =
  37. 37.19² =
  38. 38.59² =
  39. 39.51² =
  40. 40.39² =

Answer key

  1. 5041
  2. 3481
  3. 441
  4. 1681
  5. 7921
  6. 841
  7. 4761
  8. 841
  9. 8281
  10. 4761
  11. 1681
  12. 6241
  13. 5041
  14. 7921
  15. 961
  16. 8281
  17. 5041
  18. 6561
  19. 841
  20. 1521
  21. 5041
  22. 6241
  23. 7921
  24. 2401
  25. 3721
  26. 4761
  27. 6241
  28. 5041
  29. 1521
  30. 2601
  31. 3721
  32. 6561
  33. 4761
  34. 6561
  35. 7921
  36. 1521
  37. 361
  38. 3481
  39. 2601
  40. 1521

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