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Ms. Hamilton, Math, 1st

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Hamilton's Math Update 10-19-26

This week, your child is learning to use the strategy of making a ten to add two numbers.

Adding two numbers can be simpler when one of the numbers is 10. Your child can make a ten to help them quickly add two numbers that have a total greater than 10 because children are familiar with adding 10 and some more ones to make teen numbers.

                    9 + 3 is the same as 10 + 2.

                                     10 + 2 = 12

                                            and

                                      9 + 3 = 12

  • You can use counters to make a ten. Start with 9 counters and 3 counters.  Take 1 counter with 3 to make a ten.

 

Hamilton's Math Update 9-21-26

We are starting Unit 2 – Addition and Subtraction within 20

Standards Addressed: 1.NBT.B.2  Understand that the two digits of a two-digit number represent amounts of tens and ones.

Lesson Objectives:

  • Understand that 10 ones is called 10 or a group of 10
  • Compose and decompose teen numbers into a ten and some ones with concrete objects and other visual representations, as well as with words and numbers.

Math Vocabulary:

  • Compose: to make by combining parts. You can put together numbers to make a new number or shape to make a new shape
  • Decompose: to break into parts. You can break apart numbers and shapes.
  • Ones: single units or objects
  • Tens: groups of 10 ones
  • Teen Numbers: counting numbers that have ten ones and some more ones from 1 to 9. The numbers 11 to 19.

In this unit, your child will learn to think about the number 10 as a ten or putting 10 ones together to make a ten.  Your child will compose (put together) and decompose (take apart) teen numbers.

Your child will see that all teen numbers are made up of a ten and some ones.  They will learn that a teen number tells how many tens and ones.

                               A group of 10 ones is called a ten

                                    5 + 10 = 15

                                    10 + 5 = 15

Your child will continue to build on these ideas in future lessons as they add and subtract teen numbers.

Activities you can do with your child:

Materials:  groups of 11 to 19 small objects.

Help your child describe a teen number of objects as a ten and some more ones

Have your child go on a scavenger hunt around your home for a group of objects that they think there is a teen number of, such as the spoons in a drawer or a small pile of beads. Have them pick up the objects without counting.

  • Count the objects with your child to check how many there are. Have them make a group of ten and some more ones.
  • Ask your child to SAY the teen number and describe it as a ten and some more ones.
  • Have your child find and count more groups of objects.

Hamilton's Math Update Lesson 4 Sept. 8

I-Ready Lesson 4 Update:

Standards Addressed:

1.OA.B.4 Understand subtraction as an unknown addend problem.

1.OA.C.5 Relate counting to addition and subtraction

1.OA.C.6 Add and subtract within 20, demonstrate fluency for addition and subtraction within 19

Lesson Objectives:

  • Understand the relationship between addition and subtraction
  • When efficient, use a counting-on strategy to solve subtraction problems
  • Identify, write, and use related addition and subtraction equations to solve subtraction Problems

Math Vocabulary:

  • Total  the number you get when you add two or more numbers
  • Result  what is there in the end after something has been done
  • Part  a piece of a whole

In this unit, your child will use addition facts they know to help them solve subtraction problems.  

When they know one fact, they can use what th know to find a missing number in a related fact.

They will also use number bonds to help see an addition equation.

Activities you can do with your child:

Materials:  10 small household objects such as beans, coins, or paper clips; a cup or sheet of paper.

Help your child find how many objects are hidden.

  • Put up to 10 of the objects on the table. Have your child count the objects on the table.  Then hide some of the objects under a cup or a sheet of paper.
  • Ask your child this problem using the number of objects you placed on the table: There are 6 beans on the table. You can see some of the beans. The rest are hidden.  How many beans are hidden?
  • Ask your child to count on to solve the problem. Encourage your child to count on from the number of objects they see to the number of objects in all.  Your child may raise one finger for each number they say or use a number path to keep track of the hidden objects. Encourage your child to say the numbers aloud as they count.
  • Show the hidden objects. Have your child count to see if they are right.

Dates of Unit  Week of Aug. 17 - Aug 24th

Dear Family, 

In this lesson your child is learning how modeling can help them solve addition and subtraction word problems.  

Your child can model a problem by acting out the situation or by using objects or drawings to represent parts of the problem.  Your child can also model a problem by writing an equation and describing what each number and symbol represents. 

Standards We Are Learning

Standards addressed:  CCSS 1.0A.A.1

Unit Overview:

Students will learn to add and subtract within 20 to solve word problems using:

  • Objects, drawings, and equations with a symbol for the unknown number to represent the problem
  • Reason abstractly and quantitatively

Essential Questions

Throughout this lesson, students will think about how modeling what is happening in an addition and subtraction problem can help you solve it.

Lesson Objectives:

Content Objectives

Understand the meaning of actions described in addition and subtraction problems. 

Show and describe the actions in word problems using physical models and symbols.

Connect the meaning of models and symbols to contexts of word problems

Analyze word problems to determine how to solve them.

Hamilton's Math Update 8-10-26

Welcome to first-grade math!  I am so excited to help your child find their love of learning in math!

This week, we will start Unit 1, learning about addition and subtraction within 10. Students will build a strong understanding of numbers by exploring how numbers can be broken apart and put together in different ways.

We will practice using strategies such as counting on, counting back, and making connections to ten. Students will use pictures, objects, number sentences, and hands-on activities to model and solve addition and subtraction problems.

Throughout the unit, we will also learn important math vocabulary, talk about our thinking, and practice explaining how we solved a problem. Students will have opportunities to reflect on their learning and develop positive habits such as perseverance, asking questions, and trying different strategies when a problem feels challenging.

Most importantly, we will connect math to real-life situations so students can see how addition and subtraction are used every day!

Unit Vocabulary:

Addition                    equal sign

Count back                equation

Count on                    plus sign

Fact family                minus sign

Subtraction