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Math

Teacher:

Welcome Mathematicians!

Welcome to Quarter 3!
Go Math Chapter 5

We are getting into double digit subtraction with and without regrouping. Students will be using various strategies to subtract numbers within 100. We will emphasize real-world application with one, two, and multi-step word problems this unit. Remember, students must always include an equation and units to represent their math problem and final answer.

2.NBTB.5 Fluently add and subtract within 100 using strategies based on place value, properties of operations, and/or the relationship between addition and subtraction.

Key Vocabulary
Hundreds
Tens
Ones
Difference
Regroup
Model
Expanded form
Break apart
Standard algorithm

Strategies
Break apart ( break apart tens and ones using a model and/or expanded form)
Model (draw tens and ones to add, make groups of tens and ones, or count on)
Standard Algorithm (line up numbers vertically by place value, always start in the ones place)
Hundreds Chart/Number Line

At home practice ideas: (mix addition and subtraction)
Use random objects around the house (beans, cotton balls, toys, books, etc) and have students listen to direction. For example: "There are 65 cotton balls, put 22 in the bathroom, how many cotton balls are left?
Roll dice and create equations (addition or subtraction and solve)
Count out ingredients for dinner, put some away or in the meal, how many are left?
When putting away groceries or other household items, count how many items in all and ask the student to put away a group (ie fruits, vegetables, grains, etc) and see how many items are left.
Flaschards to build automaticity
Set up equations on dry erase boards or paper, use rainbow markers or fun utensils to write.
Create a craft using pipe cleaners for tens and pom poms for ones. Create combinations of equations based on how many tens and ones the picture has.

Noticings
If you notice that your child is struggling with their addition and subtraction facts within 20, please let us know! We can help create flash cards to practice. Mental math and automaticity with math facts will set students up for success in math for second and third grade!