Find the Unknown
Word Problems
Addition Fact that Helps
Find the Total
Comparing
Count on or count back?
100
6 - 0 = ?
6 - 0 = 6
100
Mel has 2 pennies.
She gets some more.
Now she has 7 pennies.
How many pennies did Mel get?
Use RDW to solve.
2 + ? = 7
2 + 5 = 7
Mel got 5 more pennies.
100
Subtract.
Write the addition + sentence that helps.
9 - 5 = ?
9 - 5 = 4
5 + 4 = 9
100
How many total Cheeseburgers were eaten?
11 Cheeseburgers were eaten.
5 + 2 + 4 = 11
100
Deb has 4 pennies.
Sara has 7 pennies.
How many more pennies does Sara have than Deb?
Use RDW to solve.
4 + ? = 7
7 - ? = 4
7 - 4 = ?
Sara has 3 more pennies than Deb.
100
Use your number path to count on or count back to subtract. What is the most efficient?
10 - 3 = ?
10 - 3 = 7
Counting back is the most efficient.
10... 9, 8, 7
200
10 - 10 = ?
10 - 10 = 0
200
Katie had 9 pencils in her desk.
She lost some.
Now she has 5 pencils.
How many pencils were lost?
Use RDW to solve.
9 - ? = 5
9 - 4 = 5
4 pencils were lost.
200
Subtract
Write the addition + sentence that helps.
9 - 3 = ?
9 - 3 = 6
3 + 6 = 9
200
How many total fruits were collected?
There were 12 fruits collected.
4 + 4 + 4 = 12
200
Ben has 6 dogs.
Todd has 9 dogs.
How many more dogs does Todd have than Ben?
Use RDW to solve.
6 + ? = 9
9 - ? = 6
9 - 6 = 3
Todd has 3 more does than Ben.
200
Use your number path to count on or count back to subtract. What is the most efficient?
11 - 8 = ?
11 - 8 = 3
Counting on is the most efficient.
8... 9, 10, 11
300
10 - ? - 6
4
10 - 4 = 6
300
Zan has 10 shells.
He gets some more.
Now he has 15 shells.
How many shells did Zan get?
Use RDW to solve.
10 + ? = 15
10 + 5 = 15
Zan got 5 more shells.
300
Subtract
Write the addition + sentence that helps.
10 - 3 = ?
10 - 3 = 7
3 + 7 = 10
300
How many total apples were sampled?
12 total apples were sampled.
4 + 5 + 3 = 12
300
Cam has 12 crackers
Tam has 7 crackers.
Sam has 2 crackers.
How many more crackers does Cam have than Sam?
Use RDW to solve.
2 + ? = 12
12 - ? = 2
12 - 2 = ?
Cam has 10 more crackers than Sam.
300
Use your number path to count on or count back to subtract. What is the most efficient?
12 - 8 = ?
12 - 8 = 4
Counting on is the most efficient.
8... 9, 10, 11, 12
400
10 + ? = 17
7
10 + 7 = 17
400
Dan had 12 cars.
He lost some.
Now he has 7 cars.
How many cars were lost?
Use RDW to solve.
12 - ? = 7
12 - 5 = 7
5 cars were lost.
400
Subtract
Write the addition + sentence that helps.
7 - 4 = ?
7 - 4 = 3
4 + 3 = 7
400
How many total animals are in the zoo?
4 + 2 + 7 = 13
There are 13 animals in the zoo.
400
Jon has 8 muffins.
Max has 4 muffins.
Wes has 6 muffins.
How many more muffins does Wes have than Max?
Use RDW to solve.
4 + ? = 6
6 - ? = 4
6 - 4 = ?
Wes has 2 more muffins than Max.
400
Use your number path to count on or count back to subtract. What is the most efficient?
14 - 3 = ?
14 - 3 = 11
Counting back is the most efficient.
14... 13, 12, 11
500
14 - ? = 12
2
14 - 2 = 12
500
Dan had 9 cupcakes.
Dan made some more.
Now there are 12 cupcakes.
How many cupcakes did Dan make?
Use RDW to solve.
9 + ? = 12
9 + 3 = 12
Dan made 3 cupcakes.
500
Subtract
Write the addition + sentence that helps.
8 - 2 = ?
8 - 2 = 6
2 + 6 = 8
500
How many toys were sold?
6 + 4 + 3 + 4 = 17
17 toys were sold.
500
Ned has 9 dollars.
Kit has 7 dollars.
Baz has 3 dollars.
How many more crayons does Ned have than Baz?
Use RDW to solve.
9 - ? = 3
3 + ? = 9
9 - 3 = ?
Ned has 6 more crayons than Baz.
500
Use your number path to count on or count back to subtract. What is the most efficient?
13 - 11 = ?
13 - 11 = 2
counting on is the most efficient.
11... 12, 13