Let's solve the problems step by step.
---
Q1. Fill the blanks
####
a) \( 451 + 332 = \_\_\_\_\_\_ + 183 \)
1. First, calculate \( 451 + 332 \):
\[
451 + 332 = 783
\]
2. Now, we need to find a number \( x \) such that:
\[
x + 183 = 783
\]
3. Solve for \( x \):
\[
x = 783 - 183 = 600
\]
Answer:
\[
\boxed{600}
\]
---
####
b) \( \_\_\_\_\_\_ - 3589 = 1243 \)
1. Let the unknown number be \( y \). We have:
\[
y - 3589 = 1243
\]
2. Solve for \( y \):
\[
y = 1243 + 3589 = 4832
\]
Answer:
\[
\boxed{4832}
\]
---
####
c) The difference between 13 hundreds 15 tens and 42 tens 94 ones is \_\_\_\_\_\_.
1. Convert "13 hundreds 15 tens" into a number:
\[
13 \text{ hundreds} = 13 \times 100 = 1300
\]
\[
15 \text{ tens} = 15 \times 10 = 150
\]
\[
1300 + 150 = 1450
\]
2. Convert "42 tens 94 ones" into a number:
\[
42 \text{ tens} = 42 \times 10 = 420
\]
\[
94 \text{ ones} = 94
\]
\[
420 + 94 = 514
\]
3. Find the difference:
\[
1450 - 514 = 936
\]
Answer:
\[
\boxed{936}
\]
---
####
d) The sum of 3370 and 1630 is \_\_\_\_\_\_ tens.
1. Calculate the sum:
\[
3370 + 1630 = 5000
\]
2. Express 5000 in terms of tens:
\[
5000 \div 10 = 500 \text{ tens}
\]
Answer:
\[
\boxed{500}
\]
---
####
e) \( 5034 = 5000 + \_\_\_\_\_\_ + 4 \)
1. Let the unknown number be \( z \). We have:
\[
5034 = 5000 + z + 4
\]
2. Simplify:
\[
5034 = 5004 + z
\]
3. Solve for \( z \):
\[
z = 5034 - 5004 = 30
\]
Answer:
\[
\boxed{30}
\]
---
Q2. There were 1200 red buttons and 687 fewer blue buttons than red buttons in a box.
####
a) How many blue buttons were there in the box?
1. Let the number of blue buttons be \( B \).
2. According to the problem:
\[
B = 1200 - 687
\]
3. Calculate:
\[
B = 1200 - 687 = 513
\]
Answer:
\[
\boxed{513}
\]
---
####
b) How many red and blue buttons were there in the box altogether?
1. Total number of buttons = Number of red buttons + Number of blue buttons.
2. Substitute the values:
\[
\text{Total} = 1200 + 513
\]
3. Calculate:
\[
\text{Total} = 1713
\]
Answer:
\[
\boxed{1713}
\]
---
Final Answers:
-
Q1:
- a) \(\boxed{600}\)
- b) \(\boxed{4832}\)
- c) \(\boxed{936}\)
- d) \(\boxed{500}\)
- e) \(\boxed{30}\)
-
Q2:
- a) \(\boxed{513}\)
- b) \(\boxed{1713}\)
Parent Tip: Review the logic above to help your child master the concept of 4th grade math addition and subtraction worksheet.
