Page 64 - TG_G1_CH6_CHRIS

Problem-Solving Strategies
A Math Story Have children look at the pictures while you read the math story.
Ask: How many frogs are in the lake? 23
There are 23 frogs in the lake.
How many frogs join them? 10
How many frogs are there altogether? 33

10 frogs join them.

How many frogs are there in the lake?
ANCHOR ACTIVITY
1 2 3 4 5 6 7 8 9 10
11 12 13 14 15 16 17 18 19 20
21 22 23 24 25 26 27 28 29 30
31 32 33 34 35 36 37 38 39 40 Use the Anchor Activity for this lesson as a warm-up to gauge
41 42 43 44 45 46 47 48 49 50 33 frogs
51 52 53 54 55 56 57 58 59 60 children’s prior knowledge and help them engage at the
61 62 63 64 65 66 67 68 69 70 beginning of class.
71 72 73 74 75 76 77 78 79 80
81 82 83 84 85 86 87 88 89 90
91 92 93 94 95 96 97 98 99 100
1.NBT.4 Add within 100, including adding a two-digit number and a one-digit number, and adding a two-digit number and a multiple
of 10, using concrete models or drawings and strategies based on place value, properties of operations, and/or the relationship
between addition and subtraction, relate the strategy to a written method and explain the reasoning used. Understand that in
adding two-digit numbers, one adds tens and tens, ones and ones, and sometimes it is necessary to compose a ten.
1.NBT.5 Given a two-digit number, mentally find 10 more or 10 less than the number, without having to count, explain the reasoning used.
1.NBT.6 Subtract multiples of 10 in the range 10–90 from multiples of 10 in the range 10–90 (positive or zero differences). Using concrete
models or drawings and strategies based on place value, properties of operations and/or the relationship between addition and
subtraction, relate the strategy to a written method and explain the reasoning used.
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TIME TO LEARN TIME TO LEARN
Steps for problem solving
1 Read and understand Underline what you know.
the problem. Circle what you need to find.
2 Make a plan. How can you solve the problem? Guide the students to apply the strategy shown in the children page to solve
Solve the problem by: any math problem.
3 Carry out the plan. Drawing a picture.
Making a table.
4 Check. Does your answer make sense? 1. Read and understand the problem: Read the problem to children. Let them
Is the math correct?
underline the information they have and circle what they need to find.
10 frogs join them. STEP I have 25 balloons, but there are 35 children. How many
BY
STEP more balloons do I need? 2. Make a plan: Discuss with children what is the easiest way to find the answer
for their problem.
1 Read and 25 balloons
understand the 35 children
problem. How many more balloons do I need? 3. Carry out the plan: Let children use the strategy the agreed to solve the
Draw a part from the 100 chart. problem.
Color the number of balloons on the 100 chart.
2 Make a plan. Color the number of children then count how
many steps you moved downward. 4. Check: Discuss with children if their answer is reasonable or not.
1 2 3 4 5 6
11 12 13 14 15 16
3 Carry out the plan. 21 22 23 24 25 26
31 32 33 34 35 36
41 42 43 44 45 46 10 balloons
4 Check. Count the difference again.
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