The answers to **Bridges in Mathematics Grade 1 Home Connections Answer Key Unit 4 Module 2 **are undoubtedly the best study material a student can get hold of.

## Bridges in Mathematics Grade 1 Home Connections Answer Key Unit 4 Module 2

**Bridges in Mathematics Grade 1 Home Connections Unit 4 Module 2 Session 2 Answer Key**

**Fives & Tens on the Line**

Question 1.

Fill in the missing numbers on the number lines below.

Answer:

Explanation:

Missing numbers on the number lines:

**1.** 0, 10, 20, ____.

Count by 10’s:

0, 10, 20, 20 + 10 = 30.

**2.** 20, 30, ____.

Count by 10’s: 30 – 20 = 10.

20, 30, 30 + 10 = 40.

**3.**Â 0, ___ , 10.

Count by 5’s:

=> 0, 0 + 5 = 5, 10.

**4.** 0, ____, 10, 15, ____.

Count by 5’s:

0, 0 + 5 = 5, 10, 15, 15 + 5 = 20.

**5.** 60, ____, 80.

Count by 10’s:

60, 60 + 10 = 70, 80.

**6.** 60,___, ____, ____, 100.

Count by 10’s:

60, 60 + 10 = 70, 70 + 10 = 80, 80 + 10 = 90, 100.

**7.** 100 Ã· 4(boxes) = 25.

Count by 25’s:

0, 0 + 25 = 25, 25 + 25 = 50, 50 + 25 = 75, 100.

Question 2.

Fill in the blanks to answer the questions.

a. What comes after 30 if you count by 10s?

Answer:

Explanation:

Count by 10’s:

20, 30, 30 + 10 = 40.

b. What number is 10 less than 40?

Answer:

Explanation:

Count by 10’s:

40 – 10 = 30, 40, 50.

c. When you count by 10s, what comes before 20? What comes after 50?

Answer:

Explanation:

Count by 10’s:

20 – 10 = 10, 20, 30, 40, 50, 50 + 10 = 60.

d. What comes after 90 when you count by 10s?

Answer:

Explanation:

Count by 10’s:

70, 80, 90, 90 + 10 = 100.

e. When you count by 10s, what number comes before 110? What number comes after 110?

Answer:

Explanation:

Count by 10’s:

70, 80, 90, 90 + 10 = 100, 110, 110 + 10 = 120.

f. What numbers come after 10, 20, and 30 when you count by 5s?

Answer:

Explanation:

Count by 5’s:

5, 10, 10 + 5 = 15, 20, 20 + 5 = 25, 30, 30 + 5 = 35, 35 + 5 = 40.

g. What numbers come after 90, 100, and 120 when you count by 5s?

Answer:

Explanation:

Count by 5’s:

85, 90, 90 + 5 = 95, 100, 100 + 5 = 105, 110, 115, 120, 120 + 5 = 125.

Question 3.

**CHALLENGE** Fill in the missing number on the number line below. Explain your answer.

Here is why I wrote ______________ in the empty box:

Answer:

Addition Equation:

50 + 40 = 90.

50 + 20 = 70.

=> 50, 70, 90 numbers are on number line.

Explanation:

Given Equation on number line:

50 + ?? = 90.

=> ?? = 90 – 50

=> ?? = 40.

40 Ã· 2boxes = 20.

=> 50 + 20 = 70.

**Bridges in Mathematics Grade 1 Home Connections Unit 4 Module 2 Session 5 Answer Key**

**Practice on the Line to One Hundred**

Question 1.

Solve each problem. Show your work on the number lines.

a. 50 + 30 = ______________

Answer:

Addition:

Explanation:

Given Equation:

50 + 30 = 80.

b. 60 + 40 = ______________

Answer:

Addition:

Explanation:

Given Equation:

60 + 40 = 100.

c. 70 + 20 = ______________

Answer:

Addition:

Explanation:

Given Equation:

70 + 20 = 90.

d. 50 + 50 = ______________

Answer:

Addition:

Explanation:

Given Equation:

50 + 50 = 100.

Question 2.

Write an equation to match each number line.

a.

Answer:

Addition:

40 + 30 = 70.

Explanation:

Given Equation:

40 + ?? = 70.

=> ?? = 70 – 40

=> ?? = 30.

b.

Answer:

Addition:

30 + 50 = 80.

Explanation:

Given Equation:

30 + ?? = 80.

=> ?? = 80 – 30

=> ?? = 50.

Question 3.

Add.

Answer:

Explanation:

Given Equations:

20 + 20 = 40.

40 + 20 = 60.

50 + 20 = 70.

30 + 50 = 80.

60 + 30 = 90.

70 + 30 = 100.

90 + 0 = 90.

Question 4.

Solve each problem. Show your work on the number lines.

a. 70 – 30 == ______________

Answer:

Subtraction:

Explanation:

Given Equation:

70 – 30 = 40.

b. 90 – 50 = ______________

Answer:

Subtraction:

Explanation:

Given Equation:

90 – 50 = 40.

c. 60 – 40 = ______________

Answer:

Subtraction:

Explanation:

Given Equation:

60 – 40 = 20.

d. 80 – 30 = ______________

Answer:

Subtraction:

Explanation:

Given Equation:

80 – 30 = 50.

Question 5.

Write an equation to match each number line.

a.

Answer:

Subtraction Equation:

90 – 40 = 50.

Explanation:

Given Equation:

90 – ?? = 50.

=> 90 – 50 = ??

=> 40 = ??.

b.

Answer:

Subtraction Equation:

100 – 30 = 70.

Explanation:

Given Equation:

100 – ?? = 70.

=> 100 – 70 = ??

=> 30 = ??.

Question 6.

Subtract.

Answer:

Subtraction:

Explanation:

Given Equations:

Subtraction:

60 – 20 = 40.

40 – 10 = 30.

50 – 30 = 20.

30 – 20 = 10.

70 – 50 = 20.

80 – 40 = 40.

20 – 20 = 10.