SALTA 1st grade

Standard 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. Standard 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.

11-1 Subtract Tens Using Models 11-2 Subtract Tens Using a Hundred Chart 11-3 Subtract Tens Using an Open Number Line 11-4 Use Addition to Subtract Tens 11-5 Mental Math: Ten Less Than a Number 3-ACT MATH: So Many Colors 11-6 Use Strategies to Practice Subtraction 11-7 Problem Solving: Model with Math

Topic 11 Manipulatives •

Place-value blocks Hundreds chart Open number lines Double ten-frames Connecting Cubes

• • • •

Assessment Options: Topic 11 Assessment – Use Models and Strategies to Subtract Tens (print or online) Topic 11 Performance Assessment – Use Models and Strategies to Subtract Tens Team Created Assessment

Assessment Tasks – Topic 11

Procedural Check

Application Task

1.NBT.5

Students will draw a picture to model 10 more than 50. Students will draw a picture to model 10 less than 50.

Write the number that is 10 more and 10 less than the following:

_________40__________

(DOK 1)

_________60__________

_________20__________

Use picture models or words to justify your thinking. (DOK 3)

1.NBT.6

Students will demonstrate subtracting tens from multiples of ten using manipulatives and on paper using the following problem:

Sarah’s mom bought 8 boxes of Capri Suns with ten in each box. At Sarah’s party friends drank 30 drinks. How do you know how many drinks Sarah has left? Draw to explain your thinking (DOK 3)

There are 60 students in the gym. 30 students leave. How many students are still in the gym? (DOK 1)

Jake’s class had 30 tadpoles in a tank. 10 turned into frogs. How many frogs are in the tank? How many tadpoles are in the tank? Explain your reasoning for solving the problem. Write an equation to show how you solved the problem. (DOK 3)

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