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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. 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 ÷ 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 ÷ 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.