← Squares next to a ten lesson New set →

Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 604 · 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. 1.51² =
  2. 2.91² =
  3. 3.51² =
  4. 4.39² =
  5. 5.39² =
  6. 6.81² =
  7. 7.71² =
  8. 8.59² =
  9. 9.29² =
  10. 10.51² =
  11. 11.21² =
  12. 12.79² =
  13. 13.69² =
  14. 14.29² =
  15. 15.61² =
  16. 16.71² =
  17. 17.59² =
  18. 18.69² =
  19. 19.31² =
  20. 20.61² =
  21. 21.51² =
  22. 22.59² =
  23. 23.81² =
  24. 24.49² =
  25. 25.69² =
  26. 26.91² =
  27. 27.39² =
  28. 28.81² =
  29. 29.89² =
  30. 30.91² =
  31. 31.49² =
  32. 32.31² =
  33. 33.31² =
  34. 34.29² =
  35. 35.31² =
  36. 36.19² =
  37. 37.89² =
  38. 38.19² =
  39. 39.21² =
  40. 40.89² =

Answer key

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

Free speed calculation lessons, practice and worksheets at talentjr.in/speed-maths