EGVideos Logo

Search Results

Puerto Rico - 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 - Puerto Rico
  • Standard ID - 1.NBT.5
  • Subjects - Math Common Core
  • Grade - 1

Keywords

  • Math
  • Puerto Rico grade 1
  • Numbers and Operations in Base Ten

More Puerto Rico Topics

1.OA.4 Understand subtraction as an unknown-addend problem. For example, subtract 10 – 8 by finding the number that makes 10 when added to 8. Add and subtract within 20.

1.OA.5 Relate counting to addition and subtraction (e.g., by counting on 2 to add 2).

1.OA.6 Add and subtract within 20, demonstrating fluency for addition and subtraction within 10. Use strategies such as counting on; making ten (e.g., 8 + 6 = 8 + 2 + 4 = 10 + 4 = 14); decomposing a number leading to a ten (e.g., 13 – 4 = 13 – 3 – 1 = 10 – 1 = 9); using the relationship between addition and subtraction (e.g., knowing that 8 + 4 = 12, one knows 12 – 8 = 4); and creating equivalent but easier or known sums (e.g., adding 6 + 7 by creating the known equivalent 6 + 6 + 1 = 12 + 1 = 13).

Express the length of an object as a whole number of length units, by laying multiple copies of a shorter object (the length unit) end to end; understand that the length measurement of an object is the number of same-size length units that span it with no gaps or overlaps. Limit to contexts where the object being measured is spanned by a whole number of length units with no gaps or overlaps.

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.

Here is the skill that Puerto Rico 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.

Login to

Education Galaxy Online

Education Galaxy provides award-winning online assessment for students to help prepare them for state testing. Education Galaxy is built 100% to your state standards and provides a highly-engaging and amazingly effective way for students to master all their state standards. Education Galaxy is a great tier 1 solution for practice, instruction, and assessment.