← Squares next to a ten lesson New set →

Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 700 · 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. 1.21² =
  2. 2.69² =
  3. 3.59² =
  4. 4.81² =
  5. 5.39² =
  6. 6.29² =
  7. 7.69² =
  8. 8.71² =
  9. 9.71² =
  10. 10.31² =
  11. 11.91² =
  12. 12.59² =
  13. 13.29² =
  14. 14.31² =
  15. 15.91² =
  16. 16.41² =
  17. 17.91² =
  18. 18.31² =
  19. 19.39² =
  20. 20.19² =
  21. 21.39² =
  22. 22.61² =
  23. 23.51² =
  24. 24.19² =
  25. 25.51² =
  26. 26.49² =
  27. 27.19² =
  28. 28.29² =
  29. 29.51² =
  30. 30.41² =
  31. 31.79² =
  32. 32.81² =
  33. 33.21² =
  34. 34.31² =
  35. 35.59² =
  36. 36.49² =
  37. 37.61² =
  38. 38.51² =
  39. 39.49² =
  40. 40.19² =

Answer key

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

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