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

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

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

Doubles & Doubles Plus or Minus One

Question 1.
Color the ten-strips to match each addition problem. Solve each equation.
ex: a.  Explanation:
7 + 8 = 15.

b.  Explanation:
8 + 8 = 16.

c.  Explanation:
9 + 8 = 17.

d.  Explanation:
6 + 6 = 12.

e.  Explanation:
5 + 6 = 11.

f.  Explanation:
4 + 4 = 8.

g.  Explanation:
4 + 5 = 9.

Question 2.
Doubles: Solve each problem.
3 + 3 = ____________
5 + 5 = ____________
2 + 2 = ____________
4 + 4 = ____________
1 + 1 = ____________
0 + 0 = ____________
6 + 6 = ____________
9 + 9 = ____________
8 + 8 = ____________
7 + 7 = ____________
10 + 10 = ____________
4 + 4 = ____________
3 + 3 = 6.
5 + 5 = 10.
2 + 2 = 4.
4 + 4 = 8.
1 + 1 = 2.
0 + 0 = 0.
6 + 6 = 12.
9 + 9 = 18.
8 + 8 = 16.
7 + 7 = 14.
10 + 10 = 20.
4 + 4 = 8.

Explanation:
Given Equation:
3 + 3 = 6.
5 + 5 = 10.
2 + 2 = 4.
4 + 4 = 8.
1 + 1 = 2.
0 + 0 = 0.
6 + 6 = 12.
9 + 9 = 18.
8 + 8 = 16.
7 + 7 = 14.
10 + 10 = 20.
4 + 4 = 8.

Question 3.
Doubles Plus or Minus One: Solve each problem.
3 + 4 = ____________
5 + 6 = ____________
2 + 3 = ____________
4 + 5 = ____________
1 + 2 = ____________
0 + 1 = ____________
6 + 7 = ____________
7 + 8 = ____________
8 + 9 = ____________
Given equations:
3 + 4 = 7.     or       4 + 4 – 1 = 8 – 1 = 7.
5 + 6 = 11.   or       6 + 6 – 1 = 12 – 1 = 11.
2 + 3 = 5.      or       3 + 3 – 1 = 6 – 1 = 5.
4 + 5 = 9.      or       5 + 5 – 1 = 10 – 1 = 9.
1 + 2 = 3.      or       2 + 2 – 1 = 4 – 1 = 3.
0 + 1 = 1.      or        1 + 1 – 1 = 2 – 1 = 1.
6 + 7 = 13.     or        7 + 7 – 1 = 14 – 1 = 13.
7 + 8 = 15.      or       8 + 8 – 1 = 16 – 1 = 15.
8 + 9 = 17.      or        9 + 9 – 1 = 18 – 1 = 17.

Explanation:
Given Equation:
3 + 4 = 7.     or       4 + 4 – 1 = 8 – 1 = 7.
5 + 6 = 11.   or       6 + 6 – 1 = 12 – 1 = 11.
2 + 3 = 5.      or       3 + 3 – 1 = 6 – 1 = 5.
4 + 5 = 9.      or       5 + 5 – 1 = 10 – 1 = 9.
1 + 2 = 3.      or       2 + 2 – 1 = 4 – 1 = 3.
0 + 1 = 1.      or        1 + 1 – 1 = 2 – 1 = 1.
6 + 7 = 13.     or        7 + 7 – 1 = 14 – 1 = 13.
7 + 8 = 15.      or       8 + 8 – 1 = 16 – 1 = 15.
8 + 9 = 17.      or        9 + 9 – 1 = 18 – 1 = 17.

Question 4.
CHALLENGE Solve each problem.
25 + 25 = ____________
25 + 26 = ____________
26 + 26 = ____________
26 + 27 = ____________
27 + 27 = ____________
27 + 28 = ____________  25 + 25 = 50.
25 + 26 = 51.
26 + 26 = 52.
26 + 27 = 53.
27 + 27 = 54.
27 + 28 = 55.

Explanation:
Given Equations:
25 + 25 = 50.
25 + 26 = 51.
26 + 26 = 52.
26 + 27 = 53.
27 + 27 = 54.
27 + 28 = 55.
40 + 40 = 80.
20 + 20 = 40.
50 + 50 = 100.
30 + 30 = 60.
60 + 60 = 120.
70 + 70 = 140.
100 + 100 = 200.
30 + 20 = 50.
20 + 20 = 40.
40 + 50 = 90.
50 + 60 = 110.
60 + 70 = 130.
200 + 300 = 500.
400 + 500 = 900.

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

Practice on the Line

Question 1.
Solve each problem. Show your work on the number lines.

a. 5 + 3 = ______________  Explanation:
Given equation:
5 + 3 = 8.

b. 6 + 4 = _______________  Explanation:
Given equation:
6 + 4 = 10.

c. 7 + 2 = _______________  Explanation:
Given equation:
7 + 2 = 9.

d. 5 + 5 = _______________  Explanation:
Given equation:
5 + 5 = 10.

Question 2.
Write an equation to match each number line.
a. 4 + 3 = 7.

Explanation:
Given Equation on number line:
From 4 to 7.
=> 4 + ?? = 7.
=> ?? = 7 – 4
=>?? = 3.

b. 3 + 5 = 8.

Explanation:
Given Equation on number line:
From 3 to 8.
=> 3 + ?? = 8.
=> ?? = 8 – 3
=>?? = 5.

Question 3.  Explanation:
Given Equation:
2 + 2 = 4.
4 + 2 = 6.
5 + 2 = 7.
3 + 5 = 8.
6 + 3 = 9.
7 + 3 = 10.
9 + 0 = 9.

Question 4.
Solve each problem. Show your work on the number lines.

a. 7 – 3 = ______________  Explanation:
Given Equation:
Subtraction:
7 – 3 = 4.

b. 9 – 5 = ______________  Explanation:
Given Equation:
Subtraction:
9 – 5 = 4.

c. 6 – 4 = ______________  Explanation:
Given Equation:
Subtraction:
6 – 4 = 2.

d. 8 – 3 = ______________  Explanation:
Given Equation:
Subtraction:
8 – 3 = 5.

Question 5.
Write an equation to match each number line.

a. Given equation on number line:
Subtraction Equation: 9 – 4 = 5.

Explanation:
Given on number line:
9 backwards till 5.
=> 9 – ?? = 5.
=> ?? = 9 – 5
=> ?? = 4. b. Given equation on number line:
Subtraction Equation: 10 – 3 = 7.

Explanation:
Given on number line:
10 backwards till 7.
=> 10 – ?? = 7.
=> ?? = 10 – 7
=> ?? = 3. Question 6.
Subtract.  Explanation:
Given equations:
Subtraction:
6 – 2 = 4.
4 – 1 = 3.
5 – 3 = 2.
3 – 2 = 1.
7 – 5 = 2.
8 – 4 = 4.
2 – 2 = 0.

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