Exploring Subtraction Strategies for 2nd Graders

This video tutorial covers subtraction facts, emphasizing the use of related addition facts to find differences. It explains methods like counting back and counting on, and highlights patterns in subtraction problems. The tutorial also includes practical applications through word problems, encouraging students to memorize addition and subtraction facts up to 20 for future math success.

What is one method to find the difference in subtraction?

• Counting back

• Adding numbers

• Multiplying numbers

• Dividing numbers

Tags

CCSS.1.OA.C.6

What addition fact is related to 8 minus 2?

• 3 + 5 = 8

• 2 + 6 = 8

• 4 + 4 = 8

• 2 + 4 = 6

Tags

CCSS.2.NBT.B.5

How many times do you count up from 2 to reach 8?

• 7 times

• 6 times

• 5 times

• 4 times

Tags

CCSS.1.OA.C.6

What is the difference when counting back from 8 to 5?

• 5

• 2

• 3

• 4

Tags

CCSS.1.OA.C.6

How can counters be used to solve subtraction problems?

• By arranging counters in patterns

• By removing a certain number of counters

• By dividing the counters

• By adding more counters

Tags

CCSS.2.OA.A.1

What pattern is observed with the subtraction facts starting from 10 minus 2, 10 minus 4, and so on?

• The differences increase by 2

• The subtrahends decrease by 2

• The minuends increase by 2

• The differences decrease by 2

Tags

CCSS.3.OA.D.9

What is the next number in the pattern if the subtraction facts start with 10 minus 2, then 10 minus 4, and so on?

• 10 minus 6

• 10 minus 8

• 10 minus 12

• 10 minus 10

Tags

CCSS.3.OA.D.9

What is the related addition fact for 14 minus 9?

• 5 + 9 = 14

• 9 + 5 = 14

• 6 + 8 = 14

• 4 + 10 = 14

Tags

CCSS.2.NBT.B.5

How many more pencils did Miss Cho buy than markers if she bought 9 markers and 16 pencils?

• 8 more pencils

• 7 more pencils

• 6 more pencils

• 5 more pencils

Tags

CCSS.1.OA.A.1

Why is it important to memorize addition and subtraction facts to 20?

• To enhance drawing skills

• To prepare for division

• To prepare for multiplication

• To improve reading skills

Tags

CCSS.2.NBT.B.5