# 1st Grade Common Core: 1.NBT.5

Common Core Identifier: 1.NBT.5 / Grade: 1
Curriculum: Number And Operations In Base Ten: Use Place Value Understanding And Properties Of Operations To Add And Subtract.
Detail: Given a two-digit number, mentally find 10 more or 10 less than the number, without having to count; explain the reasoning used.
13 Common Core State Standards (CCSS) aligned worksheets found:
The seven word problems on this page review skip counting by 10s.
Students must read the given number and tell what comes before and after.  They also have to add ten and subtract ten.
Use a hundreds chart to add 10 to each of the numbers shown.
Here are 8 horizontal subtraction problems and 2 word problems. This worksheet has graphics with a zookeeper and seal theme.
Learn about halves, thirds, and quarters. Compare using the symbols for greater than, less than, and equal to. Use a centimeter ruler to draw lines. Add and subtract ten using mental math. Read times on analog clocks.
THese task cards have place value blocks and partial hundreds charts. Use the models or mental math to solve. 30 cards in all. Great for learning centers, classroom scavenger hunts, exit slips, or peer practice sessions.
Each of these 30 task cards has a picture model with place value blocks or a partial hundreds chart.
Using mental math, add 10 to each 2-digit number. This worksheet has 8 horizontal problems and 2 word problems.
Use the partial hundreds charts to subtract 10 from 2-digit numbers.
Add a multiple of 10 to each 2-digit number. Each card has PV block models or a hundreds chart.
Use mental math to add 10 more to each 2-digit number. This page has 26 vertical and horizontal problems.
This page has 18 horizontal and 8 vertical problems for students to solve.
Use mental math to subtract a 1-digit number from a 2-digit number, find the value of coins, read and interpret a tally chart, measure to the nearest inch, and identify shapes that are divided into quarters.
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