Math Games

Grade 1 - Number

Standard 1.N.10 - Compare subtraction equations to find the related fact.

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.)