# Kentucky - Grade 1 - Math - Numbers and Operations in Base Ten - Mental Math - KY.1.NBT.5

### Description

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

• State - Kentucky
• Standard ID - KY.1.NBT.5
• Subjects - Math Common Core

### Keywords

• Math
• Numbers and Operations in Base Ten

## More Kentucky Topics

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.

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

Compose shapes. a. Compose two-dimensional shapes to create rectangles, squares, trapezoids, triangles, half-circles and quarter-circles composite shape and compose new shapes from the composite shapes. b. Use three-dimensional shapes (cubes, right rectangular prisms, right circular cones and right circular cylinders) to create a composite shape and compose new shapes from the composite shapes.

Partition circles and rectangles into two and four equal shares, describe the shares using the words halves, fourths and quarters, and use the phrases half of, fourth of and quarter of. Describe the whole as two of or four of the shares. Understand for these examples that decomposing into more equal shares creates smaller shares.

## Here is the skill that Kentucky requires you to master

• State Test K-PREP
• State Standards Kentucky Core Academic Standards
• Subject Math
• Topic Name Mental Math
• Standard ID KY.1.NBT.5
• Description
Given a two-digit number, mentally find 10 more or 10 less than the number, without having to count; explain the reasoning used.

### Education Galaxy’s K-PREP mastery program

Education Galaxy’s K-PREP mastery program provides online assessment and practice for students in Grades K-6 to help build mastery towards the Kentucky Core Academic Standards. Our unique online program is easy to use and enjoyable for both teachers and students. Students work on their Study Plans practicing important concepts while teachers pull formative assessment reports to identify the strengths and weaknesses of their classroom and individual students.