Topic 11 Review Envisions

Which equals 100 less than 847? Choose all that apply

• 800+40+7

• 947

• 747

• 700+40+7

The open number line shows subtraction. Complete the equation. Write the numbers being subtracted and the difference.

Is the difference equal to 325?

Groups:

(a) Yes

,

(b) No

• 615-290

• 761-436

• 552-171

• 508-183

There were 481 red balloons and 347 blue balloons. How many more red balloons are there?

• 234

• 136

• 134

• 148

Show how to add up on an open number line to find 650-380. Then write the difference below.

Think about your work in the last question. Why can you use adding up on an open number line to find 650-380? Choose all that apply.

• You should always use an open number line for any problem.

• You cannot always add up to subtract on an open number line.

• An open number line helps you break apart numbers to subtract.

• You can always add up to subtract on an open number line.

Grab a white board, and draw the place value blocks to help you solve this. Then, move the digits to where they belong on the picture.

b

c

d

a

2

7

5

3