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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 101 · 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. 1.59² =
  2. 2.29² =
  3. 3.81² =
  4. 4.79² =
  5. 5.39² =
  6. 6.29² =
  7. 7.39² =
  8. 8.19² =
  9. 9.59² =
  10. 10.61² =
  11. 11.61² =
  12. 12.71² =
  13. 13.59² =
  14. 14.19² =
  15. 15.61² =
  16. 16.81² =
  17. 17.81² =
  18. 18.69² =
  19. 19.19² =
  20. 20.29² =
  21. 21.19² =
  22. 22.79² =
  23. 23.19² =
  24. 24.49² =
  25. 25.81² =
  26. 26.79² =
  27. 27.29² =
  28. 28.39² =
  29. 29.39² =
  30. 30.41² =
  31. 31.59² =
  32. 32.71² =
  33. 33.29² =
  34. 34.49² =
  35. 35.61² =
  36. 36.69² =
  37. 37.49² =
  38. 38.71² =
  39. 39.19² =
  40. 40.29² =

Answer key

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

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