Add two-digit numbers with tens and ones.
Add Within 100 teaches second graders to add two-digit numbers by adding tens and ones, and to make a new ten when the ones add up to 10 or more. Story problems connect each strategy to real situations, with every question read aloud.
Math course · Grade 2
Add Within 100 · Learning goals
Add two-digit numbers by adding tens and ones, make a new ten when the ones add up to 10 or more, and solve addition stories.
Why it matters
Fluent addition within 100 is one of the main targets of second grade math and the base for adding bigger numbers.
Kids learn why we carry a ten instead of just following steps, so the written method makes sense later.
Adding scores, ages, prices and pages read are all two-digit addition problems kids meet every day.
Inside Add Within 100
A short read-aloud lesson first, then hands-on games and a quiz to lock it in.
Step 1 · Lesson
A short read-aloud lesson in 4 steps, with pictures and worked examples.
Step 2 · Game
Add the tens, then add the ones. (8 problems)
Step 3 · Game
The ones make a new ten. Don't forget it! (8 problems)
Step 4 · Game
Find a pair that makes 10 first! (8 problems)
Step 5 · Game
Read and listen, then add. (6 problems)
Lesson preview
This is the real lesson text your child hears, read aloud by a friendly voice.
To add two-digit numbers, add the tens and add the ones. 23 + 14: 2 tens + 1 ten is 3 tens, and 3 + 4 is 7 ones. That's 37!
Sometimes the ones make 10 or more. 27 + 15: 7 + 5 is 12 ones. Trade 10 ones for a new ten!
So 27 + 15 = 42. 2 tens + 1 ten + 1 new ten is 4 tens, and 2 ones are left.
You can also add three numbers. Look for a pair that makes 10 first: 6 + 4 + 8 = 18.
For parents
Learning sticks best when kids use it in real life. Here are simple ideas from this course.
Add up a pretend shopping list with prices under 50 cents. Ask your child to add the tens first, then the ones, and say the total out loud.
Practice
Real questions from Add Within 100. Try them with your child, then tap to see the answer.
Question 1
78
Question 2
83
Question 3
16
The full course has 30 questions with instant feedback, stars and rewards. Create a free account to play them all.
Add Within 100 · Questions from parents
Add Within 100 is a grade 2 math course for kids ages 7–8. That is Year 3 maths in the UK and Year 2 in Australia. It also works well for review in the next grade, or as a challenge for a confident younger learner.
Add two-digit numbers by adding tens and ones, make a new ten when the ones add up to 10 or more, and solve addition stories. Along the way they practice: Add Tens and Ones; Make a New Ten; Add Three Numbers; Addition Stories.
About 15 minutes in total, split into 4 short levels. Most kids finish it over two or three sessions. Progress is saved, so they can stop any time and pick up where they left off.
Yes. Add Within 100 is one of the first 2 courses in Grade 2 Math. Create a free parent account and your child can start right away.
No. Every lesson has a friendly read-aloud voice, questions are read aloud too, and the pictures help kids follow along. Confident readers can turn the voice off.
Yes. SkillBloom is built for homeschooling families. Kids work through lessons, games and quizzes on their own, and the parent dashboard shows what they finished and which skills need more practice. It works on phones, tablets and laptops.
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