To solve 72-35 on a hundreds chart, what number do I start on?
72
100
Solve using mental math by adding the same number to both. 76-29=
Add 1 to both.
77-30=47.
The difference is 47.
100
Round to the nearest hundred to find the estimated difference: 321-112.
300-100=200
100
Juliana is reading a book that is 85 pages long. She read 35 pages yesterday and 24 pages today. How many pages did Juliana read in the two days?
38 pages
200
Kaitlyn has 12 postcards and 4 photographs. How many more postcards does Kaitlyn have than photographs?
8
200
To subtract 20 from any number on a hundreds chart, which direction should I move on the chart?
Up 2 rows.
200
Use mental math to solve by adding the same number to both. 81-26=
Add 4 to both.
85-30=55.
The difference is 55.
200
Round to the nearest hundred to estimate the difference:
704-369.
700-400=300
200
Ethan had 56 model cars. He gave his brother 36 of them. How many model cars does Ethan have now?
20 model cars.
300
Draw a picture to solve. Eli has 14 CDs. Bryn has 9 CDs. How many more CDs does Eli have than Bryn?
Answer must have an accurate picture.
14-9=5. 5 CDs.
300
Write to explain. How can I use a hundreds chart to solve this number sentence: 97-32=?
Start at 97.
Move up three rows.
Move to the left 2.
The difference is 65.
300
Use mental math to solve: only change one number in the problem to solve. 77-48=
Add 2 to 48.
77-50=27.
Add 2 to 27.
27+2=29.
The difference is 29.
300
Round to the nearest ten to find the estimated difference:
361-117.
360-120=240
300
Write to explain: Describe how to check that your answer is reasonable and that you have answered the right question.
I can check that my answer is reasonable by rounding and estimating. I can check that I answered the right question by going back and reading the problem.
400
Trish invited 13 girls to a party. Five girls have already arrived. How many girls have yet to arrive? What addition sentence can be used to check the answer?
13-5=8.
8+5=13
400
Write to explain: how do I solve 64-36 on a hundreds chart?
Start at 64.
Move up three rows.
Move to the left 6.
The difference is 28.
400
To solve 35-19, Jake used 35-20 and then...
Added 1.
400
Use compatible numbers to find the estimated difference:
84-36.
Possible answers:
85-35=50 or 80-40=40.
400
Connor practices catching footballs 45 minutes each day. Today, he practiced 15 minutes after school and 10 minutes before dinner. How much time does he still need to practice?
20 minutes.
500
Write and solve a word problem that can be solved using subtraction.
Answers will vary.
500
Write to explain: how do I solve 84-39 on a hundreds chart
by changing 39 to a "close ten?"
Start on 84.
Add 1 to 39 to make 40.
Go up 4 rows.
Move to the right 1.
The difference is 45.
500
Write to explain: How can you solve 81-16 using mental math?
Answers will vary.
500
Round to the nearest thousand to estimate the difference:
5,698-2,453.
6,000-2,000=4,000
500
Emily has 15 pennies. Her brother has 10 more pennies than Emily. How many pennies do they have in all?