Worksheet

Penguin Feeding Time: Subtract Tens

Grade 1 subtraction of multiples of 10 at the zoo: count back by tens, use a number line, think addition, and solve penguin story problems.

Grade 1MathInteractive · Printable

Aligned to1.NBT.C.6

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What’s included

Single worksheet
Auto-graded online
1 Common Core standard
Printable answer key
12 questions
Classroom-ready

Details

Format: Interactive · Printable
Grade: Grade 1
Subject: Math
Question types: Fill in the blank, Multiple choice, Matching, Circle the answer, Sorting, Short answer

About this worksheet

What students practice

Students subtract multiples of 10 from multiples of 10 in the range 10 to 90.
Students use tens, counting back, and related addition facts to subtract tens.
Students solve take-away and compare story problems with multiples of 10.

How to use

Do the Fish Buckets section together with ten-rods or bundles of 10 straws. Then have students finish the Feeding Chart on their own and explain their thinking on the last problem.

Curriculum

Common Core standard covered

1.NBT.C.6

Subtract multiples of 10 from multiples of 10 in the range 10 to 90.

Preview

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Name Date

Penguin Feeding Time: Subtract Tens

Take away tens to solve zoo problems.

Fish Buckets

Each bucket holds 10 fish. Think in tens to subtract.

The zookeeper has 8 buckets of fish. Each rod shows one bucket of 10 fish. The penguins eat 5 buckets.

8 tens − 5 tens = tens
80 − 50 = fish

Count back by tens to find 90 − 40.

90, , , ,
90 − 40 =

Pip the penguin slides back on the number line. Pip starts at 70 and stops at 30. How far back did Pip slide?

70 − = 30

Use addition to help you subtract.

40 + = 60
So 60 − 40 =

The penguins ate 90 fish today. The seals ate 60 fish today. How many more fish did the penguins eat than the seals?

The penguins ate more fish.

There are 30 penguins in the pool. 10 penguins get out to eat. How many penguins are still in the pool?

30 − 10 = penguins

Feeding Chart

Choose, match, circle, sort, and explain.

There are 50 penguins on the rocks. Then 30 penguins jump into the water. Which number sentence tells how many penguins are still on the rocks?

A. 50 + 30 = 80
B. 80 − 50 = 30
C. 50 − 30 = 20
D. 50 − 20 = 30

Match each problem to its answer.

9 tens − 4 tens
7 tens − 7 tens
3 tens − 1 ten
6 tens − 3 tens

A. 30
B. 50
C. 20
D. 0

The zookeeper checks the feeding chart. Circle every number sentence that is true.

60 − 20 = 4090 − 10 = 7050 − 50 = 080 − 40 = 4070 − 30 = 3040 − 10 = 50

10.

Solve each problem. Sort it by its answer.

90 − 6070 − 5080 − 3040 − 1060 − 5090 − 40

Less than 30	Equal to 30	More than 30

11.

Some fish were in a cooler. The zookeeper took out 40 fish. Now there are 50 fish left in the cooler. How many fish were in the cooler at first?

− 40 = 50

12.

Leo has 60 fish in a bucket. He feeds 20 fish to the penguins. Then he feeds 20 fish to the puffins. How many fish are left in the bucket? Show how you know.