Add two 2-digit numbers mentally when no carrying is needed.
Where your child meets this in real life: Mental addition of prices, scores, or measurements
SEAGReady breaks add 2-digit numbers (no carry) into 2 steps, taught in order so each skill builds on the last.
Add two 2-digit multiples of 10 (e.g., 30 + 40 = 70)
Add two 2-digit numbers by partitioning into tens and ones (e.g., 23 + 45 = 68)
Three free sample questions from our add 2-digit numbers (no carry) course. Every question comes with a full explanation, and hints that guide without giving the answer away.
Niamh has 30 stickers. Her friend Aoife gives her 40 more stickers. How many stickers does Niamh have now?
Answer: A. 70 stickers
Both numbers are multiples of 10. Use the addition fact: 3 + 4 = 7 So 30 + 40 = 70 stickers.
Stuck? Start here: Both numbers are multiples of 10. What do you know about 3 + 4?
Cian has 34 football stickers. His friend Sean has 25 stickers. How many stickers do they have in total?
Answer: A. 59 stickers
Split into tens and ones: 34 = 30 + 4 25 = 20 + 5 Add tens: 30 + 20 = 50 Add ones: 4 + 5 = 9 Total: 50 + 9 = 59 stickers.
Stuck? Start here: Split each number into tens and ones. What is 34 split into?
Sean collected 20 football cards. His brother Oisin collected 50 football cards. How many cards do they have altogether?
Answer: C. 70 cards
Both numbers are multiples of 10. 2 + 5 = 7 So 20 + 50 = 70 cards altogether.
Stuck? Start here: What is 2 + 5?
This is the exact interactive worked example your child sees in SEAGReady. Step through it and watch the method build up.
Niamh collected 30 shells at the beach. Her brother Sean collected 40 shells.
How many shells did they collect altogether?
30 + 40
Step 1 of 3
Niamh collected 30 shells at the beach. Her brother Sean collected 40 shells.
How many shells did they collect altogether?
Niamh and Sean collected 70 shells altogether.
The key insight: If you know 3 + 4 = 7, then you know 30 + 40 = 70!
Watch out: 30 + 40 = 34. This adds 30 and 4, not 30 and 40. The 40 means 4 tens, not 4 ones.
These are the misconceptions we see most often in add 2-digit numbers (no carry), including the ones our practice questions are specifically designed to catch.
Struggling with add 2-digit numbers (no carry)? The real gap is often in one of these earlier topics.
SEAGReady finds the exact step where your child gets stuck, teaches it with worked examples like the one above, and brings it back for review so it sticks.