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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 640 · 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. 1.69² =
  2. 2.71² =
  3. 3.29² =
  4. 4.31² =
  5. 5.59² =
  6. 6.79² =
  7. 7.89² =
  8. 8.81² =
  9. 9.71² =
  10. 10.91² =
  11. 11.61² =
  12. 12.79² =
  13. 13.29² =
  14. 14.51² =
  15. 15.89² =
  16. 16.39² =
  17. 17.39² =
  18. 18.71² =
  19. 19.91² =
  20. 20.59² =
  21. 21.51² =
  22. 22.39² =
  23. 23.81² =
  24. 24.81² =
  25. 25.29² =
  26. 26.29² =
  27. 27.59² =
  28. 28.51² =
  29. 29.81² =
  30. 30.61² =
  31. 31.71² =
  32. 32.79² =
  33. 33.49² =
  34. 34.29² =
  35. 35.71² =
  36. 36.89² =
  37. 37.89² =
  38. 38.89² =
  39. 39.29² =
  40. 40.79² =

Answer key

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

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