# Kentucky - Grade 1 - Math - Operations and Algebraic Thinking - Number Sentences - KY.1.OA.7,8

### Description

KY.1.OA.7 Understand the meaning of the equal sign and determine if equations involving addition and subtraction are true or false. KY.1.OA.8 Determine the unknown whole number in an addition or subtraction equation relating three whole numbers.

• State - Kentucky
• Standard ID - KY.1.OA.7,8
• Subjects - Math Common Core

### Keywords

• Math
• Operations and Algebraic Thinking

## More Kentucky Topics

Understand the two-digits of a two-digit number represent amounts of tens and ones. Understand the following as special cases: a. 10 can be thought of as a bundle of ten ones — called a “ten.” b. The numbers from 11 to 19 are composed of a ten and one, two, three, four, five, six, seven, eight or nine ones. c. The numbers 10, 20, 30, 40, 50, 60, 70, 80, 90 refer to one, two, three, four, five, six, seven, eight or nine tens (and 0 ones).

Use addition and subtraction within 20 to solve word problems involving situations of adding to, taking from, putting together, taking apart and comparing, with unknowns in all positions.

Apply properties of operations as strategies to add and subtract.

Given a two-digit number, mentally find 10 more or 10 less than the number, without having to count; explain the reasoning used.

Distinguish between defining attributes versus non-defining attributes; build and draw shapes to possess defining attributes.