Complete the table. Write your own number pair in the last row.
Complete the table. Write your own number pair in the last row. Don't forget the rule box.
Use rounding to estimate and then solve. Use your estimate to check whether your answer makes sense. Show your work.
Use rounding to estimate and then solve. Use your estimate to check whether your answer makes sense. Show your work.
4C. Does your answer to 82 - 36 = ? make sense? Explain.
5. Use rounding to estimate and then solve. Use your estimate to check whether your answer makes sense. Show your work.
5c. Does your answer to 386 + 145 = ? make sense? Explain.
6. Use rounding to estimate and then solve. Use your estimate to check whether your answer makes sense. Show your work.
7. Use the tally chart and the key to complete the picture graph.
8a. Use the turn- around rule to solve and draw arrays for each fact.
8b. Use the turn- around rule to solve and draw arrays for each fact.
8c. Look at problems 10 & 11. How does drawing arrays for these fact pairs help you understand the turn- around rule?
9a. Write a number sentence to match each array.
9b. Write a number sentence to match each array.
9c. Circle the array that shows a multiplication square.
9c. Explain how the array shows a multiplication square.
10 . Li does not know the answer to 6 X 4. She does know that 5 X 4= 20, so she uses it as a helper fact. Li starts by drawing this array for 5 X 4= 20:
XXXX
XXXX
XXXX
XXXX
XXXX
Draw a picture to show how to use this array to help her figure out 6 X 4.
Explain how Li can use this array to help her figure out 6 X 4.