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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 412 · 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. 1.89² =
  2. 2.41² =
  3. 3.89² =
  4. 4.19² =
  5. 5.69² =
  6. 6.19² =
  7. 7.19² =
  8. 8.39² =
  9. 9.39² =
  10. 10.89² =
  11. 11.29² =
  12. 12.79² =
  13. 13.21² =
  14. 14.59² =
  15. 15.29² =
  16. 16.79² =
  17. 17.31² =
  18. 18.61² =
  19. 19.79² =
  20. 20.71² =
  21. 21.89² =
  22. 22.71² =
  23. 23.41² =
  24. 24.29² =
  25. 25.71² =
  26. 26.91² =
  27. 27.51² =
  28. 28.29² =
  29. 29.79² =
  30. 30.79² =
  31. 31.29² =
  32. 32.39² =
  33. 33.39² =
  34. 34.29² =
  35. 35.49² =
  36. 36.59² =
  37. 37.71² =
  38. 38.19² =
  39. 39.79² =
  40. 40.41² =

Answer key

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

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