ALEX Learning Activity Resources

   View Standards     Standard(s): [MA2019] (2) 12 :

12. Add and subtract within 1000 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.

a. Explain that in adding or subtracting three-digit numbers, one adds or subtracts hundreds and hundreds, tens and tens, ones and ones; and sometimes it is necessary to compose or decompose tens or hundreds.

[MA2019] (2) 21 :

21. Use addition and subtraction within 100 to solve word problems involving same units of length, representing the problem with drawings (such as drawings of rulers) and/or equations with a symbol for the unknown number.

In this elaborate activity, students will independently solve metric measurement word problems involving length. The students will combine the same length (10 cm.) multiple times. Students will use strategies based on place value and the properties of operation to add within 1,000. The students will use drawings or equations to explain their strategy.

This activity was created as a result of the ALEX Resource Development Summit.

   View Standards     Standard(s): [MA2019] (2) 12 :

12. Add and subtract within 1000 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.

a. Explain that in adding or subtracting three-digit numbers, one adds or subtracts hundreds and hundreds, tens and tens, ones and ones; and sometimes it is necessary to compose or decompose tens or hundreds.

In this before activity, students will engage in a number talk to link strategies used with numbers within 100 to numbers within 1,000. The number talk uses numbers under 120.

This activity was created as a result of the ALEX Resource Development Summit.

   View Standards     Standard(s): [MA2019] (2) 12 :

12. Add and subtract within 1000 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.

a. Explain that in adding or subtracting three-digit numbers, one adds or subtracts hundreds and hundreds, tens and tens, ones and ones; and sometimes it is necessary to compose or decompose tens or hundreds.

Students will use strategies based on place value to subtract in this explore activity. Students will bridge from using a concrete model to using a number line drawing when subtracting within 1,000.

This activity was created as a result of the ALEX Resource Development Summit.

   View Standards     Standard(s): [MA2019] (2) 12 :

12. Add and subtract within 1000 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.

a. Explain that in adding or subtracting three-digit numbers, one adds or subtracts hundreds and hundreds, tens and tens, ones and ones; and sometimes it is necessary to compose or decompose tens or hundreds.

This activity requires students to solve a subtraction problem within 1,000, then show their computation strategy on a number line. The activity includes a parallel task. The parallel task uses the same word problem with different number magnitudes (within 1,000, within 100, and within 25). The students will be allowed to choose the word problem with the magnitude level with which they are most comfortable.

This activity was created as a result of the ALEX Resource Development Summit.