1. Let's look at the first group (a):
Group a:
🔟 🔟 🔟 🔟 🔟
(5 tens)
➕
🔟 🔟 🔟 🔟 🔟
(5 tens)
Group a:
1️⃣ 1️⃣ 1️⃣ 1️⃣ 1️⃣
(5 ones)
=
1️⃣ 1️⃣ 1️⃣ 1️⃣ 1️⃣
(5 ones)
Total a:
🔟 🔟 🔟 🔟 🔟 1️⃣ 1️⃣ 1️⃣ 1️⃣ 1️⃣
(5 tens and 5 ones)
2. The multiplication is how many groups times how many in each group.
Here we have 3 rows of numbers: 5 tens, 5 ones, and 5 ones.
3. So the multiplication expression is $3 \times 15 = 45$ because each row has 15 items (5 tens + 5 ones).
4. Let's see it for b and c, they are the same, so $3 \times 15 = 45$ for each.
🎉 Great! The answer for each group is 45.
Final answer:
$a = 45$
$b = 45$
$c = 45$🔟 🔟 🔟 🔟 🔟 1️⃣ 1️⃣ 1️⃣ 1️⃣ 1️⃣
(5 tens and 5 ones)