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National - 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.

Additional Info

  • State - National
  • Standard ID - 1.NBT.5
  • Subjects - Math Common Core
  • Grade - 1

Keywords

  • Math
  • National grade 1
  • Numbers and Operations in Base Ten

More National Topics

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.

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.

Subtract multiples of 10 in the range 10-90 from multiples of 10 in the range 10-90 (positive or zero differences), 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.

Order three objects by length; compare the lengths of two objects indirectly by using a third object.

Here is the skill that National requires you to master

  • Grade Level 1
  • State Test
  • State 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.

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