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Grade 1 - Number

Standard 1.N.10 - Practice subtracting half from a number. Recognize the similar numbers in subtracting half of a number.

Included Skills:

Describe and use mental mathematics strategies (memorization not intended), such as:
counting on and counting back
making 10
doubles
using addition to subtract to determine the basic addition facts to 18 and related subtraction facts.

Achievement Indicators
Students who have achieved this outcome(s) should be able to:
- Use and describe a personal strategy for determining a given sum.
- Use and describe a personal strategy for determining a given difference.
- Write the related subtraction fact for a given addition fact.
- Write the related addition fact for a given subtraction fact.
(It is not intended that students recall the basic facts but become familiar with strategies to mentally determine sums and differences.)

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