Clare subtracts and represents her work with a base-ten diagram.
Write an equation to represent Clare’s work.
Represent Clare’s method on the number line.
Find the value of .
Show your thinking using a base-ten diagram.
Represent how you found the value of on the number line.
Activity 2
Diego finds the value of . He says he can count on by tens, then by ones. He uses a number line to show what he means.
Write an equation to show the sum for Diego’s work.
Find the value of .
Show your thinking using the number line.
Find the value of .
Show your thinking using the number line.
Find the value of .
Show your thinking using the number line.
Standards Alignment
Building On
2.MD.6
Represent whole numbers as lengths from 0 on a number line diagram with equally spaced points corresponding to the numbers 0, 1, 2, …, and represent whole-number sums and differences within 100 on a number line diagram.
Fluently add and subtract within 100 using strategies based on place value, properties of operations, and/or the relationship between addition and subtraction.
Represent whole numbers as lengths from 0 on a number line diagram with equally spaced points corresponding to the numbers 0, 1, 2, …, and represent whole-number sums and differences within 100 on a number line diagram.
Fluently add and subtract within 100 using strategies based on place value, properties of operations, and/or the relationship between addition and subtraction.
Represent whole numbers as lengths from 0 on a number line diagram with equally spaced points corresponding to the numbers 0, 1, 2, …, and represent whole-number sums and differences within 100 on a number line diagram.
Fluently add and subtract within 100 using strategies based on place value, properties of operations, and/or the relationship between addition and subtraction.
