Number Grids
Use the Everyday Mathematics Number Grid to find the difference between 91 and 117.
What is...
Answer: 26
Use an open number line to round each number to the nearest 10.
79 rounded to the nearest 10
What is...
Answer: 80
Use an open number line to round each number to the nearest 100.
642 rounded to the nearest 100
What is...
Answer: 600
Write the time shown on each clock.
You may use your toolkit clock to help you.
NOTE: See Slide 9
What is...
Answer: 3:52
Sarah starts piano practice at 4:25 P.M. and finishes at 5:20 P.M. She drew an open number line and used it to find the length of her practice.
See Slide 10
Explain Sarah’s work:
What is...
Answer:
- First, Sara started at 4:25.
- Then, she skip counted by 5 minutes to get to 4:30.
- After that, she skip counted by 15 minutes twice to get to 5:00.
- Finally, she skip counted by 10 minutes twice to get to her end time of 5:20.
- When she added up the time, she found that her practice was 55 minutes.
Use the Everyday Mathematics Number Grid to find the difference between 99 and 124.
What is...
Answer: 25
Use an open number line to round each number to the nearest 10.
91 rounded to the nearest 10
What is...
Answer: 90
Use an open number line to round each number to the nearest 100.
288 rounded to the nearest 100
What is...
Answer: 300
Write the time shown on each clock.
You may use your toolkit clock to help you.
NOTE: See Slide 9
What is...
Answer: 11:35
Solve. You may use your toolkit clock or an open number line to help you. Show your work.
Brendan starts hockey camp at 10:20 A.M.
He finishes at 4:40 P.M.
How many hours and minutes does Brendan spend at hockey practice?
What is..
Answer: Brendan spends 6 hours 20 minutes at hockey practice.
Explain how you used the number grid to find difference between 91 and 117.
What is...
Answer:
- First, I skip counted by 10, two times to get 111.
- Next, I counted by 1, 6 times to get 117.
- Since 20 + 6 = 26, the difference is 26.
Use an open number line to round each number to the nearest 10.
567 rounded to the nearest 10
What is...
Answer: 570
Use an open number line to round each number to the nearest 100.
1,230 rounded to the nearest 100
What is...
Answer: 1,200
Which hand is the hour hand on a clock?
What is...
Answer: The short hand.
Explain how you used the number grid to find difference between 99 and 124.
What is...
Answer:
- First, I skip counted by 10, two times to get 119.
- Next, I counted by 1, 5 times to get 124.
- Since 20 + 5 = 25, the difference is 25.
Use an open number line to round each number to the nearest 10.
423 rounded to the nearest 10
What is...
Answer: 420
Use an open number line to round each number to the nearest 100.
4,552 rounded to the nearest 100
What is...
Answer: 4,600
Which hand is the minute hand on a clock?
What is...
Answer: The long hand.
Justin and Sabrina played Number-Grid Difference. The object of the game is to have the lower sum of 5 scores.
Justin picked 4 and 6 and made the number 46.
Sabrina picked 9 and 2.
What number should Sabrina Make?
What is...
Answer: 29