Complete the following addition problems using base-ten blocks and show your work for each step.

Question

ScanSolve AI Tutor · Accepted Answer

Here are the completed rows for the table:

Row 1: $38 + 25 =$

Add the units.
$8 \text{ units} + 5 \text{ units} = 13 \text{ units}$
Add the tens.
$3 \text{ tens} + 2 \text{ tens} = 5 \text{ tens}$
Combine and write the number.
$5 \text{ tens} + 13 \text{ units} = 50 + 13 = 63$

Row 2: $77 + 31 =$
Add the units.
$7 \text{ units} + 1 \text{ unit} = 8 \text{ units}$
Add the tens.
$7 \text{ tens} + 3 \text{ tens} = 10 \text{ tens}$
Combine and write the number.
$10 \text{ tens} + 8 \text{ units} = 100 + 8 = 108$

Row 3: $68 + 45 =$
Add the units.
$8 \text{ units} + 5 \text{ units} = 13 \text{ units}$
Add the tens.
$6 \text{ tens} + 4 \text{ tens} = 10 \text{ tens}$
Combine and write the number.
$10 \text{ tens} + 13 \text{ units} = 100 + 13 = 113$

Row 4: $83 + 47 =$
Add the units.
$3 \text{ units} + 7 \text{ units} = 10 \text{ units}$
Add the tens.
$8 \text{ tens} + 4 \text{ tens} = 12 \text{ tens}$

$12 \text{ tens} + 10 \text{ units} = 120 + 10 = 130$

Here is the completed table:

Use base ten blocks to make these two numbers.	All together how many tens? how many units?	Did you group tens or units? Check the place value where you regrouped.	Write the number.
$23 + 99 =$	11 tens, 12 units	11 tens + 12 units = 110 + 12	122
$38 + 25 =$	5 tens, 13 units	5 tens + 13 units = 50 + 13	63
$77 + 31 =$	10 tens, 8 units	10 tens + 8 units = 100 + 8	108
$68 + 45 =$	10 tens, 13 units	10 tens + 13 units = 100 + 13	113
$83 + 47 =$	12 tens, 10 units	12 tens + 10 units = 120 + 10	130

Step-by-step solution