Adding 3-Digit Numbers without Regrouping Worksheet

Question 1

Find the sum: 234 + 125.

Accepted Answer

The sum is 359 because 4 + 5 = 9, 3 tens + 2 tens = 5 tens, and 2 hundreds + 1 hundred = 3 hundreds.

Question 2

Find the sum: 412 + 326.

Accepted Answer

The sum is 738 because 2 + 6 = 8, 1 ten + 2 tens = 3 tens, and 4 hundreds + 3 hundreds = 7 hundreds.

Question 3

Add 153 + 224.

Accepted Answer

The sum is 377 because the ones add to 7, the tens add to 7, and the hundreds add to 3.

Question 4

A class has 241 blue counting cubes and 328 red counting cubes. How many counting cubes are there in all?

Accepted Answer

There are 569 counting cubes in all because 241 + 328 = 569.

Question 5

Find the sum: 620 + 134.

Accepted Answer

The sum is 754 because 0 + 4 = 4, 2 tens + 3 tens = 5 tens, and 6 hundreds + 1 hundred = 7 hundreds.

Question 6

Add 305 + 482.

Accepted Answer

The sum is 787 because 5 + 2 = 7, 0 tens + 8 tens = 8 tens, and 3 hundreds + 4 hundreds = 7 hundreds.

Question 7

Mia read 123 pages in one book and 456 pages in another book. How many pages did she read altogether?

Accepted Answer

Mia read 579 pages altogether because 123 + 456 = 579.

Question 8

Find the sum: 271 + 418.

Accepted Answer

The sum is 689 because 1 + 8 = 9, 7 tens + 1 ten = 8 tens, and 2 hundreds + 4 hundreds = 6 hundreds.

Question 9

Add 132 + 243 + 321.

Accepted Answer

The sum is 696 because 2 + 3 + 1 = 6, 3 tens + 4 tens + 2 tens = 9 tens, and 1 hundred + 2 hundreds + 3 hundreds = 6 hundreds.

Question 10

A store sold 214 pencils on Monday and 375 pencils on Tuesday. How many pencils did the store sell in all?

Accepted Answer

The store sold 589 pencils in all because 214 + 375 = 589.

Question 11

Find the sum: 506 + 273.

Accepted Answer

The sum is 779 because 6 + 3 = 9, 0 tens + 7 tens = 7 tens, and 5 hundreds + 2 hundreds = 7 hundreds.

Question 12

Add 361 + 527.

Accepted Answer

The sum is 888 because 1 + 7 = 8, 6 tens + 2 tens = 8 tens, and 3 hundreds + 5 hundreds = 8 hundreds.

Question 13

A farmer picked 432 apples from one tree and 157 apples from another tree. How many apples did the farmer pick in all?

Accepted Answer

The farmer picked 589 apples in all because 432 + 157 = 589.

Question 14

Find the missing sum: 245 + 333 = ____.

Accepted Answer

The missing sum is 578 because 245 + 333 = 578.

Question 15

A library has 342 storybooks and 216 science books. How many books are there altogether?

Accepted Answer

There are 558 books altogether because 342 + 216 = 558.

Adding 3-Digit Numbers without Regrouping