This goes really well with the make ten math fact strategy.
Compose and decompose numbers how to#
Now that students have had practice with decomposing numbers, they need practice on how to use those decomposed numbers to compose numbers to find answers to math facts. Find these I Spy Math Fact Worksheets here. When they come to facts that don’t equal 10, they write it on the recording sheet and give the answer. Students have to find certain math facts. On these pages, I have hidden lots of different addition equations. I also have my students practice with my I Spy Math Facts Worksheets. Find this puzzle to practice decomposing numbers here. I also set it out as a fast finisher activity. Students have to find all the ways to make a number and put it around the star. I also like to have my 2nd grade students practice decomposing numbers by solving math fact puzzles. Then I give students a set number of counters and they have to write all the equations to make that number. We continue to flip over different numbers of yellow counters until we get all the ways to make that number. I place out a number of counters and then flip some over to yellow. When I teach my students how to decompose numbers, I like to use counters. So we know why decomposing numbers to 10 is important, but how can we actually help students see how to do this and apply it? I share my 7 Steps to Ensure Math Fact Mastery in my free workbook for 1st and 2nd grade teachers here. That is why it is so important for students to practice decomposing numbers.ĭecomposing and composing numbers is actually one of the first steps to getting students to math fact mastery. These reasoning strategies show that students are well on their way to math facts mastery. If the equation is 6+8, students say 6 is 5 and 1, and 8 is 5 and 3, so 5+5=10 and 1+3=4, 10+4=14, so the answer is 14. Oftentimes students are decomposing numbers to get to the answer. One of my favorite math fact activities is to put up a math fact equation and then ask students how they get to the answer.
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