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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 832 · 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. 1.29² =
  2. 2.29² =
  3. 3.69² =
  4. 4.79² =
  5. 5.79² =
  6. 6.79² =
  7. 7.59² =
  8. 8.91² =
  9. 9.81² =
  10. 10.49² =
  11. 11.29² =
  12. 12.29² =
  13. 13.19² =
  14. 14.41² =
  15. 15.41² =
  16. 16.61² =
  17. 17.19² =
  18. 18.31² =
  19. 19.21² =
  20. 20.89² =
  21. 21.79² =
  22. 22.51² =
  23. 23.19² =
  24. 24.31² =
  25. 25.31² =
  26. 26.79² =
  27. 27.29² =
  28. 28.59² =
  29. 29.39² =
  30. 30.89² =
  31. 31.91² =
  32. 32.61² =
  33. 33.71² =
  34. 34.21² =
  35. 35.69² =
  36. 36.61² =
  37. 37.29² =
  38. 38.19² =
  39. 39.21² =
  40. 40.19² =

Answer key

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

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