First Grade Number and Operations in Base Ten Tasks

Use place value understanding and properties of operations to add and subtract. (1.NBT.4-1.NBT.6)



1.NBT.4. 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.


Overview of Problem Types (Glossary, Table 1).

Additional

Standards Assessed

Problem-Type

Task

Student Form


Add to- Result Unknown



Add to- Result Unknown


1.NBT.5
Add to- Result Unknown


1.NBT.5
Add to- Result Unknown










1.NBT.5. Given a two-digit number, mentally find 10 more or 10 less than the number, without having to count; explain the reasoning used.

Additional

Standards Assessed

Task

Blackline Master




1.NBT.1




1.NBT.6. 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.

Task

Blackline Master


Student Form