How does knowing how to mentally add or subtract 10 help us make quick decisions in everyday life?
Critical Thinking: Analyzing and applying mental math strategies for adding or subtracting 10.
Communication: Articulating the thought process behind mental calculations.
Adaptive Perseverance: Adjusting and refining strategies for mental addition and subtraction to enhance problem-solving skills.
Why is it useful to quickly find 10 more or 10 less than a number?
How can we mentally add or subtract 10 from a two-digit number?
In what everyday situations might we need to quickly add or subtract 10?
Students will be able to mentally calculate 10 more or 10 less than a given two-digit number.
Students will explain the reasoning behind their methods for adding or subtracting 10 mentally.
Students will apply this skill to solve realistic problems efficiently.
Standard
1.NBT.C.5: Given a two-digit number, mentally find 10 more or 10 less than the number, without having to count.
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