Melissa 635-119 User Manual download pdf (Page 120)

Grade 3 A33 Chapter 3

Chapter 3 Assessment Answer Key

Page 77, Chapter Extended-Response Test

Sample Answers

In addition to the scoring rubric found on page A32, the following sample answers

may be used as guidance in evaluating open-ended assessment items.

1. a. Subtraction is when you subtract

one number from another.

b. Subtraction without regrouping

is when you subtract the ones.

Subtraction with regrouping is when

you subtract and there are not

enough ones to subtract from so

you need to regroup.

c. You subtract money just like you

subtract whole numbers. For

example: $2 - $1 is the same

as 2 - 1.

2. a. The three different methods of

estimation include estimation

using rounding, estimation using

compatible numbers.

b. Rounding is most likely to give you

an estimate that is farthest from the

actual answer because you round

the first number and change the rest

to zeros. For example, if you have

the number 267 and change the

number to 300 for estimating, you

are 33 away from the real number.

c. Sample problem: Melissa makes

$28 a week babysitting. Daniel

makes $36 dollars a week cutting

grass. About how much more

does Daniel make in a week than

Melissa?

Answer: About $10 more.

3. a. It costs $2 more to get a turkey sub

than a fruit salad.

b. It will cost $6 to get an apple, a milk

and a salad.

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Melissa 635-119 User Manual Page 120