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CCSS.MATH.CONTENT.1.OA.A.2

## Basics on the topicAdding Using Chart

The hundreds chart is an incredible tool to help solve problems, see patterns, or even just count! The hundreds chart is organized with numbers one through one hundred in columns and rows. How do you add using a chart?

• Always start by circling the bigger addend, or number on the chart.

• Next, count on the amount of the second addend or number.

• Finally, the number that you land on is the sum, or answer.

Would you like to apply the knowledge you’ve learned? You can review and practice it with the tasks for the video Adding Using Chart.
• ### What are the steps for adding on a 100 chart?

Hints

Addend is a special name for the numbers that you are adding together.

You will find the sum at the very end of an addition problem.

Solution

To solve an addition problem using a 100 chart, follow the steps below:

1. Find the bigger addend. For example, in the problem 12 + 4 = ?, 12 is the larger addend.
2. Circle the bigger addend on the 100 chart. For example, in the problem, 12 + 4 = ?, you would circle 12 on the number chart.
3. Find the smaller addend. For example, in the problem 12 + 4 = ?, 4 is the smaller addend.
4. Count on the amount of the smaller addend. For example, in the problem, 12 + 4 = ?, begin at the number 12 that you have circled and then count on 4 more.
5. The number that you land on is the sum, or answer. For example, in the problem, 12 + 4 = ?, you land on the number 16. So, 12 + 4 = 16.
• ### Solve an addition sentence using a 100 chart.

Hints

The larger addend is 35. So, you should begin at the number 35 on the 100 chart.

The smaller addend is 8. You need to count on 8 more from 35 to find the sum on the 100 chart.

Remember, you should read a 100 chart like a book: from left to right!

Solution

Here are the steps for solving the equation, 35 + 8 = ?, with a 100 chart:

• Begin at the larger addend, which is 35. Circle 35 on the 100 chart.
• Count on the amount of the smaller addend. In this equation, the smaller addend is 8, so you should count on 8 spaces on the 100 chart.
• The number that you land on, 43, is the sum. So, 35 + 8 = 43.

• ### Determine the sum of an addition sentence.

Hints

To solve an equation, first find and begin at the larger addend on the 100 chart.

Count on the amount of the smaller addend to find the sum.

Remember, you read a 100 chart like a book: from left to right!

Solution

To solve an addition problem using a 100 chart, follow the steps below:

2. Circle the bigger addend on the 100 chart.
4. Count on the amount of the smaller addend.
5. The number that you land on is the sum, or answer.

When you solve, the equations and sums should match as follows:

• 44 + 6 = 50
• 10 + 7 = 17
• 42 + 11 = 53
• 75 + 6 = 81

• ### Identify the sum of an addition sentence using a 100 chart.

Hints

Look at the equation carefully to find the larger addend. It is not always the first number that you see.

Remember, begin at the larger addend on the 100 chart and count up the smaller addend amount. The number you land on is the sum.

Solution

To solve an addition problem using a 100 chart, follow the steps below:

1. Determine the bigger addend. This is not always the first number! For example, in the equation 3 + 70 = ?, 3 comes first, but 70 is greater than 3!
2. Circle the bigger addend on the 100 chart.
4. Count on the amount of the smaller addend.
5. The number that you land on is the sum, or answer.

When you solve, the equations and sums should match as follows:

• 3 + 70 = 73
• 28 + 7 = 35
• 61 + 7 = 68
• 40 + 12 = 52

• ### Show how to add on a 100 chart.

Hints

The addends are 50 and 6. The bigger number is already highlighted on the 100 chart.

The smaller addend is 6. Count up from 50 to find the sum.

Remember, you read a 100 chart like a book: from left to right!

Solution

To solve the equation, 50 + 6 = ?, first find the larger addend, which is 50. 50 is already highlighted. Next, find the smaller addend, which is 6. Count up until you reach the sum, 56. Highlight each number as you count.

• ### Calculate the sum of each addition sentence.

Hints

Look carefully, the larger addend is not always the first number in the equation.

Remember, to solve with the 100 chart, begin at the larger addend and count up the amount of the smaller addend.

Solution

Sum of 72

• 12 + 60 = 72
• 50 + 22 = 72
Sum of 90
• 69 + 21 = 90
• 2 + 88 = 90
Sum of 45
• 36 + 9 = 45
• 20 + 25 = 45