Common Core State Standards: CCSS.MATH.CONTENT.1.NBT.C.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.
CCSS.MATH.CONTENT.1.NBT.C.5
Given a two-digit number, mentally find 10 more or 10 less than the number, without having to count; explain the reasoning used.
CCSS.MATH.CONTENT.1.NBT.C.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.
Objective
- Students will view a 360° video and compare the number of different items shown in the video.
Recommended Teaching Strategy
Example 360° Learning Experience
Show students the recommended video and ask them to name the numbers they can see. In their math journals, students should select a pair of numbers and add them together. Once they find the sum, students should write the numbers that are 10 more and 10 less than the sum, using base ten blocks or drawings to model and show their thinking. For example, based on this video, that would be 8+5=13, 10 Above: 23, 10 Below: 3. Students would then repeat the process until they have found 3-5 sums and 10 above and below each sum. For an extra challenge, students can add more than 2 numbers together, and subtract or add larger multiples of 10 to their sums. Students can share their findings with a partner during a think-pair-share activity or with the whole class as a group discussion.