Students will be able to represent a given missing addend word problem using a number sentence.

Addition and Subtraction Facts to 20 Developing the Concept Once children are comfortable with using a few different strategies to solve addition and subtraction problems, encourage children to apply them to the facts to If manipulatives such as cubes are available, children may find it helpful to use them and fact cards.

You will use many of the same strategies that you used in facts to 10 and add several new ones. Encourage children to share the strategies they use and tell why they used them. Prepare fact cards for addition facts through 20 and for the corresponding subtraction facts.

Write the strategy on each card. Prerequisite Skills and Concepts: Children should have a good foundation in addition and subtraction facts through There are different ways to help us learn our addition and subtraction facts. They are called strategies, and they make learning the facts easier.

Today we are going to talk about some of those strategies. One of the ways we can learn some of our facts is to use the doubles strategy. That means that the two addends, or the two numbers we add, are the same.

I am going to write two addends on the chalkboard. Point out that both numbers are the same. Have a volunteer write the equals sign and sum. Then have children write the fact on their papers. Repeat with several different double facts. You may want to point out that all doubles have sums that are even numbers.

You can use doubles to help you learn other facts. They are called doubles-plus-one facts. Look at both facts. What is the same and what is different? Elicit that both facts have a 5 as one addend, but in the second fact, the second addend has been changed to 6, or one more than 5.

What do you think the sum will be? The second addend was 1 more so the sum should be 1 more. What is the sum? Did the sum change? Why or why not? No; the addends have been reversed, but they are the same numbers, so the sum will be the same. Have children write the facts.

Repeat with other doubles-plus-one facts. Today we will talk more about related facts. Notice that the addends and the sums in each fact are the same, but the numbers in the addends are reversed.

Today we are going to write more of these related addition facts. Who can tell me the sum? The sum is Invite a volunteer to write the equals sign and the answer. Have all the children then write the number sentence on their papers. This fact has used three numbers.a.

use the number books that a costumer can buy to write a domain for this problem. b. if Katrese does not want to spend more than $25, the number of books she might buy, b is given by the expression 6b is less than or equal to find the solution set of this open sentense using the domain from part a.

can find a missing addend by subtracting.

For the number sentence 8 + w = 15, we subtract eight from 15 to find the missing number: 15 − 8 = 7 Example 1 Find the missing addend: 24 + m 37 There are two addends and the sum. 24 + m 37 addend addend sum One of the addends is The sum is We subtract 24 from 37 and find that the missing addend is † Use hyphens when writing the numbers 21–99 (except numbers that end with 0).

four hundred twenty-six eight hundred nine † Don’t write “and” unless you mean a decimal point. $ two dollars and seventy-eight cents Practice: Use words to write each number.

1. 3 2. 75 3. 88 4. 5. Use digits to write each number. 6. fifteen 7. ANSWER KEY Addition with 4-Digit Addends Find the sums. a. 7, 4 4 7 b. 3, 9 8 6 + 2, 9 8 7 + 3, 9 2 0 1 0, 4 3 4 7, 9 0 6 c. 6, 9 7 8 d. 2, 4 0 8 e. 5, 8 7 6 f.

The number has 4 ones. Write the number word. asked by vohn on September 18, ; Math 2nd grade. It is greater than 7 tens and less than 8 tens. the number has 4 ones. write the number word. asked by Rita on October 7, ; math. It is greater than 7 tens and less than 8 tens. The number has 4 ones. Write the number word. Fun and (Math) Games! Saturday School A Success At Lincoln Elementary reads the headline from Madison, Wisconsin. Even on a Saturday, and even on a day that felt like summer, dozens of students at one elementary school spent the morning in class. C Add two numbers with four or more digits - word problems C Add three or more numbers with four or more digits - word problems D.3 Subtract numbers up to three digits - word problems.

6, 2. Adding a Multiple of 10 (ver. 1) kaja-net.comC.5 Given a two-digit number, mentally find 10 more or 10 less than the number, without having to count; explain the reasoning used. Sample Activities: Ten More Race Around (v.1) Also included in 1st Grade Math Centers: Race Around + 10 (v.

The two videos below explain several strategies for learning addition and subtraction facts, including number rainbows and fact families.

After the videos, there follows a complete lesson with many exercises and word problems about fact families with 13 and 14 (where the sum is 13 or 14), taken from my book Math Mammoth Add & Subtract 2-A.

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Second Grade Math Common Core State Standards: Overview