2.7 Add Three-Digit Numbers

347 + 862 =

423 + 907 =

782 + 348 =

63 + 28 =

268 + 239 =

What is the largest sum of two two digit numbers using the digits 3, 4, 5, and 6 exactly once?

What is the largest sum of two three digit numbers using the digits 3, 4, 5, 6, 7, and 8 exactly once?

What is the smallest sum of two two digit numbers using the digits 3, 4, 5, and 6 exactly once?

We have 238 glue stick and 548 pencils. A student donated 35 more glue sticks. Now, how many pencils and glue sticks do we have altogether? *no label

Match the following

• makes sense

• sum

• result of addition

• unknown

• rename a number using place value

• regroup

• result of subtraction

• reasonable

• a missing number is ...

• difference