Let's solve the problems step by step.
---
Problem 7: Add the following digits
We'll add each set of numbers carefully.
#### i) $13 + 25 + 31$
Break it down:
- $13 + 25 = 38$
- $38 + 31 = 69$
✔ Answer: $69$
#### ii) $27 + 34 + 40$
- $27 + 34 = 61$
- $61 + 40 = 101$
✔ Answer: $101$
#### iii) $45 + 62 + 61 + 30$
Add step by step:
- $45 + 62 = 107$
- $107 + 61 = 168$
- $168 + 30 = 198$
✔ Answer: $198$
#### iv) $67 + 82 + 49 + 79$
- $67 + 82 = 149$
- $149 + 49 = 198$
- $198 + 79 = 277$
✔ Answer: $277$
---
Problem 8: Write the repeated addition equation for the model in two ways
We are given a grid of yellow stars:
```
★ ★ ★ ★
★ ★ ★ ★
★ ★ ★ ★
```
This is a
3 rows × 4 columns arrangement → total of $3 \times 4 = 12$ stars.
We need to write
repeated addition equations in
two different ways.
---
#### a) Adding by rows (each row has 4 stars, and there are 3 rows):
$$
4 + 4 + 4 = 12
$$
✔ Answer: $4 + 4 + 4 = 12$
---
#### b) Adding by columns (each column has 3 stars, and there are 4 columns):
$$
3 + 3 + 3 + 3 = 12
$$
✔ Answer: $3 + 3 + 3 + 3 = 12$
---
✔ Final Answers:
####
Problem 7:
i) $13 + 25 + 31 = \boxed{69}$
ii) $27 + 34 + 40 = \boxed{101}$
iii) $45 + 62 + 61 + 30 = \boxed{198}$
iv) $67 + 82 + 49 + 79 = \boxed{277}$
####
Problem 8:
a) $4 + 4 + 4 = 12$
b) $3 + 3 + 3 + 3 = 12$
---
🔍 Explanation:
- In
Problem 7, we simply added the numbers sequentially.
- In
Problem 8, the star pattern shows
3 rows of 4 stars or
4 columns of 3 stars, so repeated addition can be done either way. This helps understand the concept of multiplication as repeated addition.
Let me know if you'd like this explained visually or with diagrams!
Parent Tip: Review the logic above to help your child master the concept of maths worksheet for grade 3.
