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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 599 · 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. 2.41² =
  3. 3.21² =
  4. 4.41² =
  5. 5.69² =
  6. 6.41² =
  7. 7.51² =
  8. 8.29² =
  9. 9.61² =
  10. 10.59² =
  11. 11.81² =
  12. 12.69² =
  13. 13.29² =
  14. 14.61² =
  15. 15.91² =
  16. 16.71² =
  17. 17.79² =
  18. 18.19² =
  19. 19.69² =
  20. 20.29² =
  21. 21.79² =
  22. 22.49² =
  23. 23.59² =
  24. 24.81² =
  25. 25.59² =
  26. 26.39² =
  27. 27.29² =
  28. 28.79² =
  29. 29.71² =
  30. 30.19² =
  31. 31.51² =
  32. 32.79² =
  33. 33.81² =
  34. 34.71² =
  35. 35.19² =
  36. 36.51² =
  37. 37.41² =
  38. 38.89² =
  39. 39.81² =
  40. 40.51² =

Answer key

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

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