Topic 8 Review

Cube Method

1

When using the cube method (drawing base ten blocks), I show that I am regrouping 10 ones to make a new ten by _____.

circling 10 ones, putting an arrow over to the tens column, and drawing a new ten

2

Using the cube method, add the following numbers (hint- rewrite vertically before adding): 20+26

The sum is 46

3

Using the cube method, add the following numbers (hint- rewrite vertically before adding): 13+29

The sum is 42

4

Using the cube method, add the following numbers (hint- rewrite vertically before adding): 70+19

The sum is 89

5

Using the cube method, add the following numbers (hint- rewrite vertically before adding): 48+47

The sum is 95

Pencil & Paper

1

When using the paper & pencil method, I show that I am regrouping 10 ones to make a new ten by _____.

putting a 1 at the top of the tens column and writing how many leftover ones I have at the bottom of the ones column

2

Using the paper & pencil method, add the following numbers (hint- rewrite vertically before adding): 54+3

The sum is 57

3

Using the paper & pencil method, add the following numbers (hint- rewrite vertically before adding): 28+11

The sum is 39

4

Using the paper & pencil method, add the following numbers (hint- rewrite vertically before adding): 34+37

The sum is 71

5

Using the paper & pencil method, add the following numbers (hint- rewrite vertically before adding): 67+26

The sum is 93

Adding More Than 2 Numbers

1

Add and find the sum (remember to rewrite the numbers vertically before adding): 22+24+22

The sum is 68

2

Add and find the sum (remember to rewrite the numbers vertically before adding): 15+18+25

The sum is 58

3

Add and find the sum (remember to rewrite the numbers vertically before adding): 36+32+16

The sum is 84

4

Add and find the sum (remember to rewrite the numbers vertically before adding): 17+31+27+13

The sum is 88

5

Add and find the sum (remember to rewrite the numbers vertically before adding): 16+42+12+22

The sum is 92

Miscellaneous

1

How many ones do you need in order to regroup and make a new group of ten?

10 ones

2

First, I add the ____.

ones

3

Why do you add the ones before the tens?

You add the ones first because you may need to regroup and make a new group of ten.

4

Do you have to regroup when you add 71+23? Explain why or why not.

No, I do not regroup because there are not enough ones to make a ten. 

5

Do you have to regroup when you add 57+18? Explain why or why not.

Yes, I regroup because I have more than 10 ones and I can make a new group of ten.

(I regroup 15 ones as 1 ten and 5 ones.)