Addition (Grade 1)
Videos and songs to help Grade 1 kids learn how to add within 100,
including
adding a two-digit number and a
one-digit number, and
adding a two-digit number and a multiple of
10, using concrete models or drawings and strategies based
on place value, properties of operations, and/or the relationship
between addition and subtraction; relate the strategy to a written
method and explain the reasoning used.
Understand that in adding two-digit numbers, one adds tens and tens,
ones and ones; and sometimes it is necessary to compose a ten.
Common Core: 1.NBT.4
Learning Targets:
- I can use concrete models or drawings to show a strategy based
on place value (collecting tens, collecting ones, and if
necessary, composing ten ones to make a ten) and other
strategies (such as applying the operations properties) to add
the following: a two-digit number and a one-digit number, a
two-digit number and a multiple of ten, and a two-digit number
and a two-digit number.
- I can write down and explain the steps that I followed as I
used the concrete models or drawings to show how I added.
- I know the addition and subtraction fact families.
- I know how to model addition and subtraction using base ten
manipulatives (e.g., base ten blocks, Digi-Blocks, Unifix cubes)
and explain the process.
Related Topics:
More
Lessons for Grade 1
Common Core for
Grade 1
1.NBT.4 - Add a Two-Digit Number and One-Digit Number
This video explains how to adds a 2-digit number with a 1-digit
number. This video illustrates 1.NBT.4 from the Common Core State
Standards for Mathematics.
12 + 4 = ?, 13 + 4 = ?, 15 + 4 = ?, 4 + 15 = ?, 12 + 8 = ?, 2 + 18 = ?
1.NBT.4 - Adding a Multiple of 10 to a Two-Digit Number
This video explains how to add a two-digit number and a multiple of
10, using concrete models and strategies based on place value. It
uses number discs to show students how to solve the following
problems:
42 + 40 = ?, 50 + 36 = ?
Adding 1 and 2 Digit Numbers
72 + 4 = ?, 38 + 5 = ?, 26 + 10 = ?, 55 + 7 = ?, 48 + 10 = ?
Long Addition - 1 by 2 digit numbers without carrying
This video introduces the basic idea to all long addition problems
22 + 3, 34 + 4, 53 + 6, 54 + 5, 92 + 6
Long Addition - 1 by 2 digit numbers with carrying
28 + 5, 37 + 9, 45 + 8, 99 + 9
Adding a 2 digit number and 1 digit with carry
86 + 7 = ?
This video demonstrates adding two digit numbers without regrouping,
showing the addition with longs and cubes (base 10 blocks).
24 + 12
This video demonstrates adding two digit numbers with regrouping,
showing the addition with longs and cubes (base 10 blocks).
Adding two digit numbers
How to add two 2 digit numbers with a carry.
Adding Two Digit Numbers (with Carrying).
For Teachers
Addition Within 100
Grades K-2 / Math / Reasoning
CCSS: Math.1.NBT.C.4 Math.Practice.MP2 Math.Practice.MP3
Lesson Objective
Use multiple strategies to solve addition problems
1.NBT.4
The Common Core State Standards (CCSS) videos are designed to
support states, schools, and teachers in the implementation of the
CCSS. Each video is an audiovisual resource that focuses on one or
more specific standards and usually includes examples/illustrations
geared to enhancing understanding. The intent of each
content-focused video is to clarify the meaning of the individual
standard rather than to be a guide on how to teach each standard
although the examples can be adapted for instructional use.<
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