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Mental Math
And
Estimating the
Sum
?
??
Sign of the Cross
Prayer to the Holy Spirit
Come, Holy Spirit,
fill the hearts of your faithful
And kindle in them
the fire of your love.
Send forth your Spirit,
and they shall be created.
And you shall renew
the face of the earth.
Let us pray:
O God, who by the light
of the Holy Spirit,
did instruct the hearts
of the faithful,
Grant that
by the same Holy Spirit
we may be truly wise
and ever rejoice
in His consolations.
Through the same
Christ Our Lord.
Amen.
Our Lady of Chartres,
pray for us!
St. Paul,
pray for us!
the Apostle our Patron,
Fr. Louis Chauvet
Intercede for us!
and our First Sisters
May the charity
of Christ impel us,
Amen.
now and forever,
Sign of the Cross
Life Performance
Outcome
I am a mindful, self-directed
learner and role model, consciously
expressing my Faith.
Essential Performance
Outcome
Take time to plan, pray, and have
quiet time every day and encourage
others to do the same.
Intended Learning
Outcome
• Add mentally 2-digit and 1-digit numbers without or with
regrouping using appropriate strategies, focusing on
accuracy and speed in quick mathematical computations.
• Estimate the sum of 3- to 4-digit addends and reflect on
the importance of making reasonable estimates in problem-
solving, much like organizing one’s thoughts before taking
action.
Lesson 8.............................pptx
Lesson 8.............................pptx
Lesson 8.............................pptx
Lesson 8.............................pptx
Lesson 8.............................pptx
Lesson 8.............................pptx
Lesson 8.............................pptx
Lesson 8.............................pptx
Lesson 8.............................pptx
Lesson 8.............................pptx
35 + 2=?
37
82 + 4=?
86
27 + 7=?
34
81 + 8=?
89
64 + 6=?
70
37 +
10=
?
47
45 +
21=
?
66
63 +
36=
?
99
Processing Questions:
1.What helped you solve the problem faster—grouping
numbers, visualizing, or something else?
2.How do you think practicing quick mental addition can
help you in your daily activities, like organizing your
time or solving simple problems?"
?
ESTIMATIN
G THE SUM
Lesson 8.............................pptx
Lesson 8.............................pptx
Lesson 8.............................pptx
Lesson 8.............................pptx
Lesson 8.............................pptx
Lesson 8.............................pptx
Lesson 8.............................pptx
Lesson 8.............................pptx
Lesson 8.............................pptx
Lesson 8.............................pptx
Lesson 8.............................pptx
Lesson 8.............................pptx
Lesson 8.............................pptx
Lesson 8.............................pptx
Lesson 8.............................pptx
Lesson 8.............................pptx
Lesson 8.............................pptx
Lesson 8.............................pptx
Lesson 8.............................pptx
Lesson 8.............................pptx
Lesson 8.............................pptx
Lesson 8.............................pptx
Lesson 8.............................pptx
Lesson 8.............................pptx
Lesson 8.............................pptx
Lesson 8.............................pptx
Lesson 8.............................pptx
Lesson 8.............................pptx
Lesson 8.............................pptx
Lesson 8.............................pptx
Lesson 8.............................pptx
Lesson 8.............................pptx
Lesson 8.............................pptx
Lesson 8.............................pptx
Lesson 8.............................pptx
Lesson 8.............................pptx
Lesson 8.............................pptx
Lesson 8.............................pptx
Lesson 8.............................pptx
Lesson 8.............................pptx
Lesson 8.............................pptx
Lesson 8.............................pptx
Processing Questions:
1.Why is it important to make a reasonable estimate before
adding large numbers?
2.Can you think of a time when making an estimate helps you plan
better, like knowing how much time you need to complete your
homework?
3.How can estimating help you make better decisions in your daily
life, like knowing how much something will cost or how much

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Lesson 8.............................pptx