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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 610 · 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. 1.51² =
  2. 2.71² =
  3. 3.81² =
  4. 4.51² =
  5. 5.39² =
  6. 6.91² =
  7. 7.41² =
  8. 8.61² =
  9. 9.51² =
  10. 10.29² =
  11. 11.21² =
  12. 12.81² =
  13. 13.89² =
  14. 14.29² =
  15. 15.59² =
  16. 16.71² =
  17. 17.79² =
  18. 18.19² =
  19. 19.31² =
  20. 20.49² =
  21. 21.41² =
  22. 22.39² =
  23. 23.31² =
  24. 24.89² =
  25. 25.79² =
  26. 26.71² =
  27. 27.49² =
  28. 28.59² =
  29. 29.59² =
  30. 30.89² =
  31. 31.71² =
  32. 32.69² =
  33. 33.59² =
  34. 34.19² =
  35. 35.79² =
  36. 36.79² =
  37. 37.29² =
  38. 38.31² =
  39. 39.81² =
  40. 40.51² =

Answer key

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

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