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Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 253 · 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. 2.81² =
  3. 3.79² =
  4. 4.61² =
  5. 5.61² =
  6. 6.21² =
  7. 7.71² =
  8. 8.59² =
  9. 9.91² =
  10. 10.61² =
  11. 11.59² =
  12. 12.31² =
  13. 13.19² =
  14. 14.79² =
  15. 15.29² =
  16. 16.51² =
  17. 17.21² =
  18. 18.81² =
  19. 19.61² =
  20. 20.31² =
  21. 21.89² =
  22. 22.59² =
  23. 23.49² =
  24. 24.79² =
  25. 25.49² =
  26. 26.21² =
  27. 27.71² =
  28. 28.21² =
  29. 29.29² =
  30. 30.19² =
  31. 31.49² =
  32. 32.49² =
  33. 33.81² =
  34. 34.69² =
  35. 35.81² =
  36. 36.29² =
  37. 37.89² =
  38. 38.91² =
  39. 39.71² =
  40. 40.59² =

Answer key

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

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