Embedded Files
Overview
Overview
An addition strategy involves keeping one number whole and decomposing the second number so that one part of it added to the first number makes 10, then adding the left over.
Once students have an anchor of 10 students can be encouraged to use the strategy of up/down over 10.
This strategy is also known as decomposing to make ten. This strategy allows students to be flexible and quickly complete adding and subtracting situations.
Using Up/Down Over 10 is the beginning stages of decomposing numbers. Students who use this strategy are comfortable with making 10. It is important that students practice making 10 using addition and subtraction. For example students should be comfortable using 0-10 to make ten using addition as well as using 10-20 to make ten using subtraction.
Supporting Students with Using Up/Down Over 10
Supporting Students with Using Up/Down Over 10
Using ten frames will be beneficial to all students while working with this strategy. By using the ten frames to join two amounts, while connecting the numerical version of the adding (or subtracting), students will be able to gain a stronger grasp of this strategy. Deliberate practice of decomposing numbers will be important before introducing this strategy to students.
See the example below for 5 + 7:
Games to Promote Using Up/down over 10
Games to Promote Using Up/down over 10
Handful of Dice
Handful of Dice
In this individual activity, students roll 10 die and try to make as many combinations of 10 as they can.
This activity can be used in a game format or as targeted independent practice. (Lawson; pg. 168)
Make 10 and Keep the Change
Make 10 and Keep the Change
In this engaging card game, students figure out the numbers to make ten, keeping the left over for individual points! (Lawson; digital)
A modified version of the traditional "war" card game. This game provides a wider range of 'known facts' to be used to determine the sum of the two cards flipped. (Lawson; pg. 176).
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