## Reflection: Staircase of Complexity How Many In My Hand? - Section 2: Introducing How Many In My Hand?

It is important to expose the students to standard notation and have them use it as much as possible.  This activity allows for this to be used quite easily.  There is am example of this work in the resource section.  This is a piece of student work that was completed during the lesson.  It allows me to look at their use of equations, compliments of 10 and numeral formations.

I will also add (tomorrow) the idea of an unknown addend.  I will have the students write the number that is shown, leave a blank for the hidden number and then write =10 (4+__=10).  Then after they figure out the unknown, they can fill it in. This is precisely what CCSS.Math.Content.1.OA.D.8 is addressing.

Staircase of Complexity: Reflection of Standard Notation

# How Many In My Hand?

Unit 5: Building Numbers
Lesson 4 of 7

## Objective: SWBAT solve a problem in which the total and one part are known; SWBAT record combinations of two numbers that make a certain total.

### Thomas Young

203 Lessons14 new

## Big Idea: Today everyone becomes a magician as students are able to use a known starting number and one chunk (addend) of that known number, to determine the amount that is being hidden.

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Standards:
Subject(s):
Math, Number Sense and Operations, Operations , 1st Grade, compliments of 10, standard notatio, solving for unknown addend
70 minutes

### Thomas Young

203 Lessons | 14 new

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