  # Wisconsin - Grade 1 - Math - Numbers and Operations in Base Ten - Mental Math - 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 - Wisconsin
• Standard ID - 1.NBT.5
• Subjects - Math Common Core

### Keywords

• Math
• Numbers and Operations in Base Ten

## More Wisconsin Topics Distinguish between defining attributes (e.g., triangles are closed and three-sided) versus non-defining attributes (e.g., color, orientation, overall size) ; build and draw shapes to possess defining attributes. 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. Solve word problems that call for addition of three whole numbers whose sum is less than or equal to 20, e.g., by using objects, drawings, and equations with a symbol for the unknown number to represent the problem. Count to 120, starting at any number less than 120. In this range, read and write numerals and represent a number of objects with a written numeral. Compare two two-digit numbers based on meanings of the tens and ones digits, recording the results of comparisons with the symbols >, =, and <.

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

• State Test Wisconsin Forward Exam
• State Standards Wisconsin Academic Standards
• Subject Math
• Topic Name Mental Math
• Standard ID 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.  