Mastering Addition and Subtraction: A Mathematical Journey

How can you use a visual model to show the addition of 3 + 4?

• Draw 3 circles and then 4 more circles, count all circles.

• Write the numbers 3 and 4 side by side.

• Draw a number line and make a jump of 7.

Using a number line, how would you explain subtracting 5 from 9?

• Start at 9 and make 5 jumps forward.

• Start at 9 and make 5 jumps backward.

• Start at 0 and make 9 jumps forward, then 5 jumps backward.

In the word problem, "Sally has 7 apples. She buys 5 more. How many apples does she have now?" What is the key term that indicates addition?

• buys

• apples

• now

• Break 15 into 10 and 5, then subtract 7 from 10.

• Take 1 from the 5 in 15, making it 14, then subtract 7.

• Add 7 to 15 and then divide by 2.

• A pie chart divided into 5 and 9 segments.

• A bar graph showing heights of 5 and 9.

• 5 blue dots and 9 red dots combined together.

• By showing a jump from 10 to 3.

• By starting at 10 and making 3 jumps backward.

• By starting at 3 and making 10 jumps forward.

In the problem, "If you have 4 pencils and your friend gives you 3 more, how many do you have?" what indicates an addition operation?

• pencils

• gives

• have

• Split 14 into 10 and 4, subtract 8 from 10, then add 4.

• Take 1 from the 4 in 14, making it 13, then subtract 8.

• Break 14 into 10 and 4, subtract 8 from 14 directly.