← Squares next to a ten lesson New set →

Squares Trick Worksheet

Speed calculation lesson 10: Squares next to a ten · Set 47 · 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. 1.39² =
  2. 2.61² =
  3. 3.19² =
  4. 4.91² =
  5. 5.29² =
  6. 6.69² =
  7. 7.81² =
  8. 8.91² =
  9. 9.21² =
  10. 10.39² =
  11. 11.81² =
  12. 12.61² =
  13. 13.29² =
  14. 14.41² =
  15. 15.59² =
  16. 16.51² =
  17. 17.51² =
  18. 18.61² =
  19. 19.19² =
  20. 20.89² =
  21. 21.21² =
  22. 22.21² =
  23. 23.61² =
  24. 24.59² =
  25. 25.51² =
  26. 26.19² =
  27. 27.61² =
  28. 28.69² =
  29. 29.29² =
  30. 30.79² =
  31. 31.41² =
  32. 32.71² =
  33. 33.91² =
  34. 34.71² =
  35. 35.91² =
  36. 36.21² =
  37. 37.69² =
  38. 38.61² =
  39. 39.21² =
  40. 40.71² =

Answer key

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

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