Lesson 3 Session 5

There are 4 children on a rug. More children join them. Now there are 10 children on the rug. How many children joined the first 4 children?

Answer explanation

The whole is 10. The part that we know is 4. That means the missing part must be 6!

Tags

CCSS.2.OA.A.1

There are 5 cows in the barn. There are 8 more cows in the field than in the barn. How many cows are in the field?

Answer explanation

If there are 5 cows in the barn and there are 8 more in the field, then we must add 5 and 8 to find out how many are in the field. 5 + 8 = 13!

Tags

CCSS.2.OA.A.1

Jin has 9 markers. He has 5 more markers than pencils. How many pencils does Jin have? Choose which equations could be used to solve the problem. THERE IS MORE THAN ONE.

• 9-5=4

• 9+5=14

• 14-5=9

• 5+4=9

Answer explanation

If he has more markers than pencils, we need to subtract 5 (the difference) from 9 (the number of markers) to find the missing part (the number of pencils).

Tags

CCSS.1.OA.A.1

13-4=

Tags

CCSS.2.OA.A.1

13-_____=4

Tags

CCSS.1.OA.D.8

13+4=

Tags

CCSS.1.OA.C.6

CCSS.2.OA.B.2

_____+4=13

Tags

CCSS.1.OA.D.8

Rick has some marbles in a bag. He adds 4 marbles to the bag. Now he has 13 marbles. How many marbles did Rick start with?

Which equations could be used to solve the problem. THERE IS MORE THAN ONE.

• 13-4=9

• 13-9=4

• 13+4=17

• 9+4=13

Tags

CCSS.2.OA.A.1