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Bridges in Mathematics Grade 1 Home Connections Answer Key Unit 2 Module 4
Bridges in Mathematics Grade 1 Home Connections Unit 2 Module 4 Session 2 Answer Key
Addition & Subtraction Practice
Question 1.
Trace the word and write it again 4 times.
Answer:
Explanation:
Number given for tracing = 6 or Six.
Number of times to trace the number = 4.
Question 2.
Fill in the answers for each of the problems.
a. Add.
3 + 3 = ____ 2 + 4 = _____ 1 + 5 = ______
0 + 6 = ____ 4 + 2 = _____ 5 + 1 = _______
3 + ___ = 6 5 + ___ = 6 4 + ___ = 6
Answer:
3 + 3 = 6.          2 + 4 = 6.              1 + 5 = 6.
0 + 6 = 6.          4 + 2 = 6.              5 + 1 = 6.
3 + 3= 6.           5 + 1= 6.               4 + 2 = 6.
Explanation:
Addition:
3 + 3 = 6.
2 + 4 = 6.
1 + 5 = 6.
0 + 6 = 6.
4 + 2 = 6.
5 + 1 = 6.
3 + ?? = 6
=> ?? = 6 -3
=> ?? = 3.
5 + ?? = 6
=> ?? = 6 – 5
=> ?? = 1.
4 + ?? = 6
=> ?? = 6 – 4
=> ?? = 2.
b. Subtract.
6 – 3 = ____ 6 – 4 = _____ 6 – 0 = _____
6 – 2 = ____ 6 – 5 = _____ 6 – 1 = _____
6 – ____ = 3 6 – ____ = 1 6 – ____ = 4
Answer:
6 – 3 = 3.          6 – 4 = 2.         6 – 0 = 6.
6 – 2 = 4.          6 – 5 = 1.         6 – 1 = 5.
6 – 3 = 3.          6 – 5 = 1.         6 – 2 = 4.
Explanation:
6 – 3 = 3.
6 – 4 = 2.
6 – 0 = 6.
6 – 2 = 4.
6 – 5 = 1.
6 – 1 = 5.
6 – ?? = 3
=> ?? = 6 – 3
=> ?? = 3.
6 – ?? = 1
=> ?? = 6 – 1
=> ?? = 5.
6 – ?? = 4
=> ?? = 6 – 4
=> ?? = 2.
Question 3.
CHALLENGE Fill in the missing numbers in the equations below.
30 + 30 = _____ 20 + 40 = _____ 50 + ___ = 60
10 + ____ = 60 30 + ____ = 60 40 + ___ = 60
20 + ____ + 20 = 60 40 + ____ + 10 = 60 40 + 0 + ___ = 60
30 + 10 + ____ = 60 10 + 20 + ____ = 60 50 + 10 + ___ = 60
Answer:
Missing numbers:
30 + 30 = 60.             20 + 40 = 60.           50 + 10 = 60.
10 + 50 = 60.             30 + 30 = 60.            40 + 20 = 60.
20 + 20 + 20 = 60.       40 + 10+ 10 = 60.        40 + 0 + 20 = 60
30 + 10 + 30 = 60.       10 + 20 + 30 = 60.        50 + 10 + 0 = 60.
Explanation:
Given equations:
Addition:
30 + 30 = 60.
20 + 40 = 60.
50 + 10 = 60.
10 + ?? = 60
=> ?? = 60 – 10
=> ?? = 50.
30 + ?? = 60
=> ?? = 60 – 30
=> ?? = 30.
40 + ?? = 60
=> ?? = 60 – 40
=> ?? = 20.
20 + ?? + 20 = 60
=> ?? + 40 = 60
=> ?? = 60 – 40
=> ?? = 20.
40 + ?? + 10 = 60
=> 50 + ?? = 60
=> ?? = 60 – 50
=> ?? = 10.
40 + 0 + ?? = 60
=> 40 + ?? = 60
=> ?? = 60 – 40
=> ?? = 20.
30 + 10 + ?? = 60
=> 40 + ?? = 60
=> ?? = 60 – 40
=> ?? = 20.
10 + 20 + ?? = 60
=> 30 + ?? = 60
=> ?? = 60 – 30
=> ?? = 30.
50 + 10 + ?? = 60
=> 60 + ?? = 60
=> ?? = 60 – 60
=> ?? = 0.
Question 4.
Fill in the blanks.
6 – ____ = 1 6 – ____ = 2 6 – ____ = 4
6 – ____ = 0 6 – ___ = 6 6 – ____ = 5
____ – 4 = 2 ___ – 3 = 3 6 – 1 = _____
6 – 4 = ____ 6 – 2 = ____ 6 – 5 = _____
Answer:
Missing numbers:
6 – 5 = 1.          6 – 4 = 2.            6 – 2 = 4.
6 – 6 = 0.          6 – 0 = 6.            6 – 1 = 5.
6 – 4 = 2.          6 – 3 = 3.            6 – 1 = 5.
6 – 4 = 2.          6 – 2 = 4.            6 – 5 = 1.
Explanation:
Given equations:
6 – ?? = 1
=> ?? = 6 – 1
=> ?? = 5.
6 – ?? = 2
=> ?? = 6 – 2
=> ?? = 4.
6 – ?? = 4
=> ?? = 6 – 4
=> ?? = 2.
6 – ?? = 0
=> ?? = 6 – 0
=> ?? = 6.
6 – ?? = 6
=> ?? = 6 – 6
=> ?? = 0.
6 – ?? = 5
=> ?? = 6 – 5
=> ?? = 1.
??- 4 = 2
=> ?? = 4 + 2
=> ?? = 6.
?? – 3 = 3
=> ?? = 3 + 3
=> ?? = 6.
6 – 1 = 5.
6 – 4 = 2.
6 – 2 = 4.
6 – 5 = 1.
Question 5.
Solve the subtraction problems.
Answer:
Equations:
Explanation:
Subtraction:
5 – 2 =4.     4 – 2 = 2.   1 – 1 = 0.    3 – 0 = 3.    5 – 1 = 4.     2 – 2 = 0.     3 – 2 = 1.
5 – 3 = 2.    4 – 1 = 3.   3 – 3 = 0.    3 -1 = 2.     5 – 0 = 5.     4 – 0 = 4.     2 – 1 = 1.
1 – 0 = 1.    4 – 3 = 1.   5 – 4 = 1.    2 – 0 = 2.     5 – 5 = 0.     4 – 4 = 0.     0 – 0 = 0.
Question 6.
There were 6 bugs outside the house. Some of them went inside to get warm. Now there are only 2 bugs outside the house. How many bugs went inside? Use numbers, pictures, or words to solve this problem.
____ bugs went inside the house.
Answer:
Number of bugs inside the house = 4.
4 bugs went inside the house.
Explanation:
Number of bugs outside the house = 6.
Number of bugs outside the house now = 2.
Number of bugs inside the house = Number of bugs outside the house – Number of bugs outside the house now
= 6 – 2
= 4.
Bridges in Mathematics Grade 1 Home Connections Unit 2 Module 4 Session 5 Answer Key
Counting by Fives & Tens
Question 1.
For each row, count how many arms the sea stars have, and write that number in the box on the right side.
Answer:
Addition:
Explanation:
Given:
Number of arms in one starfish = 5.
Number of arms in two starfish = 5 + 5
= 10.
Number of arms in three starfish = 5 + 5 + 5
= 10 + 5 = 15.
Number of arms in four starfish = 5 + 5 + 5 + 5
= 10 + 5 + 5
= 10 + 10
= 20.
Number of arms in five starfish = 5 + 5 + 5 + 5 + 5
= 10 + 5 + 5 + 5
= 15 + 5 + 5
= 20 + 5
= 25.
Question 2.
Continue the counting by 5s pattern.
Answer:
Explanation:
Counting by 5s pattern:
0Â Â 0
0Â 5
1Â 1
1Â 5
2Â 0
2Â Â 5
3Â Â 0
3Â Â 5
4Â Â 0
4Â Â 5
5Â Â 0
5Â Â 5
6Â Â 0
6Â Â 5
Question 3.
Max saw 7 sea stars. How many arms? Use numbers, pictures, or words to solve the problem.
Max saw ___ sea star arms.
Answer:
Total number of arms all sea fishes have = 35.
Max saw 35 sea star arms.
Explanation:
Number of sea stars Max saw = 7.
Number of arms each sea star has = 5.
Total number of arms all sea fishes have = Number of sea stars Max saw × Number of arms each sea star has
= 7 × 5
= 35.
Question 4.
Count the cubes in each box. Write the number on the line.
a.
Answer:
Explanation:
Number of cubes in each box = ??
=> 5 or Five.
b.
Answer:
Explanation:
Number of cubes in each box = ??
=> (1 × 10) + (5 × 1)
=> 10 + 5
=> 15 or Fifteen.
c.
Answer:
Explanation:
Number of cubes in each box = ??
=> (3 × 10) + (5 × 1)
=>30 + 5
= > 35 or Thirty Five.
d.
Answer:
Explanation:
Number of cubes in each box = ??
=> (4 × 10) + (5 × 1)
=> 40 or Forty.
e.
Answer:
Explanation:
Number of cubes in each box = ??
=> (2 × 10) + (5 × 1)
=> 20 + 5
=> 25 or Twenty five.
f.
Answer:
Explanation:
Number of cubes in each box = ??
=> (2 × 10)
=> 20 or Twenty.
g.
Answer:
Explanation:
Number of cubes in each box = ??
=> (3 × 10)
=> 30 or Thirty.
h.
Answer:
Explanation:
Number of cubes in each box = ??
=> (1 × 10)
=> 10 or Ten.
Question 5.
Fill in the missing numbers on the number line. You can use the cubes above to help you count.
Answer:
Explanation:
Missing numbers pattern:
5 is the difference from each number.
=> Missing numbers:
0 + 5 = 5.
5 + 5 = 10.
10 + 5 = 15.
15 + 5 = 20.
20 + 5 = 25.
25 + 5 = 30.
30 + 5 = 35.
35 + 5 = 40.