Chapter 1 – Number Concepts

Essential Question: How do you use place value to find the values of numbers and describe numbers in different ways?

Grade 2 Common Core State Standards

Domain: Operations and Algebraic Thinking

2.OA.C.3 Determine whether a group of objects (up to 20) has an odd or even number of members, e.g., by pairing objects or counting them by 2s; write an equation to express an even number as a sum of two equal addends

Domain: Number and Operations in Base Ten

2.NBT.A.2 Count within 1,000; skip-count by 5s, 10s, and 100s.

2.NBT.A.3 Read and write numbers to 1,000 using base-ten numerals, number names, and expanded form.

Objectives

-The students will classify numbers up to 20 as even or odd.

-The students will write equations with equal addends to represent even numbers.

-The students will use place value to describe the values of digits in 2-digit numbers.

-The students will write 2-digit numbers in expanded form.

-The students will write 2-digit numbers in word form, expanded form, and standard form.

-The students will apply place value concepts to find equivalent representations of numbers.

-The students will solve problems by finding different combinations of tens and ones to represent 2-digit numbers using the strategy find a pattern.

-The students will extend counting sequences within 100, counting by 1s, 5s, and 10s.

-The students will extend counting sequences within 1,000, counting by 1s, 5s, 10s, and 100s.

Vocabulary Terms

Digits- the symbols used in a numeration systems; the ten digits used in our base-ten numeration system are 0, 1, 2, 3, 4, 5, 6, 7, 8, and 9

Even Numbers- whole numbers that can be paired up exactly; 2, 4, 6, 8, 10 . . .

Odd Numbers- whole numbers that cannot be paired up exactly; 1, 3, 5, 7, 9 . . .

Helpful Tips

Give your child a group of 20 small objects, such as beans. Have your child count the objects and tell how many. Then have your child pair the objects and tell whether the number is even or odd. Repeat with a different number of beans.