Adding a 1-Digit Number to a 2-Digit Number

Mr. Squeaks and Imani are at the comic store adding to their collections. They are huge fans of The Adventures of Robo-Rodent, a crime fighting critter who’s part machine, part animal. Mr. Squeaks has thirty-five comics and wants to see how many he will have if he buys five more. Imani has forty-nine and wants to know their total if they add another six. Let's help them figure out how many comics they will have by "Adding a One Digit Number to a Two Digit Number"! A digit is a single number symbol we use to represent zero through nine. These numbers are called one digit numbers because they only have one digit, or number symbol, used to represent them. When we put two of these number symbols next to each other, it is called a two digit number. Sometimes we have to add a two digit number and one digit number together. When this happens, always start with the two digit number. Then, add the one digit number to it. The answer to the problem is called the sum. There are many ways to add a one digit number to a two digit number, but today we will use a ten frame! First, circle the one digit number, three. Then, fill in the ten frame with three counters. Next, start counting-on from the two digit number, eleven and stop when you reach the last counter. Let's count together: eleven, twelve, thirteen, fourteen! Fourteen is the answer! Write it here. Now, let's help Mr. Squeaks figure out how many comics he will have if he adds five more to his collection of thirty-five. First, circle the one digit number, five. Then, fill in the ten frame with five counters. Next, start counting-on from the two digit number, thirty-five. Let's count together: thirty-five, thirty-six, thirty-seven, thirty-eight, thirty-nine, forty! We stopped on forty, so we write it here as the sum. Mr. Squeaks will have forty comics! We can help Imani now! Remember, Imani has forty-nine comics and wants to add another six. What is our first step? First, circle the six. Then, fill in the ten frame with six counters. What happens next? Next, we start counting-on from forty-nine. What number do we end on? We end on fifty-five, so we write it here as the answer. Imani will have fifty-five comics! Before Mr. Squeaks and Imani leave the store, let's remember! Today we learned about adding a one digit number to a two digit number using a ten frame. Start by circling the one digit number. Then, fill in the ten frame with that number of counters. Next, start counting-on from the two digit number. Stop when you reach the last counter. This number is the answer! Look who's coming in just as Imani and Mr. Squeaks are about to leave. It's a bird, it's a plane! No! It's RoboRodent! "Can we get your PAW-tograph?!"