Page 30 - TG_G1_CH6_CHRIS

1 Peter picked 20 peppers. Piper picked
20 peppers. How many peppers do Problem-Solving questions 1 and 2 include:
• Adding tens
Peter and Piper have altogether?
40 peppers • Solving word problems concerning adding tens
2 I am a two-digit number. When I am
added to 20, the sum is a number 10 less After children solve the independent practice, make sure they understand how
than 60. What number am I? Make your own clue. to add tens in real-life situations by solving problem 1. Encourage them to read
30 the situation carefully and guide them to use the place value chart to find the
sum of the pickled pepper. The answer is 40 peppers.
Answers to the second part will vary. Sample answer: I am a two-digit number. When
you add me to 10, the sum is a number 20 more than 30 What number am I ? 40
Then have children explore a situation that includes making an inference and
justifying the answer in their own words in problem 2.
Vocabulary Check Match.
Encourage children to read the problem carefully and use the place value
chart to find the answer to the problem and discuss the answer with them. The
add ones 20 + 50 = 70 answer is 30.

After solving exercises 1 and 2, copy the additional problems below onto the
add tens 2 + 5 = 7
board for group or individual work. The additional problems are based on
adding tens. Ask: How can you add tens? Encourage them to use the place
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value concept to solve the problems.
If children have difficulty, give them a place value chart and guide them to
Vocabulary Check add tens to solve the problems.

If children struggle to make the match, write Additional problem 1
the problems on the board and point out Lee bough a candy for 30¢ and an eraser for 50¢. How much money did he
which uses tens and which uses ones. spend?
We can use the place value chart to add 50 + 30 = 80. He spent 80¢.

Additional problem 2
EXIT ACTIVITY There were 30 passengers on the bus and then 20 more passengers got on.
How many passengers are in the bus in all?
We can use the place value chart to add 30 + 20 = 50 passengers.
Use the Exit Activity for this lesson to
reinforce children’s understanding. This
can be used as an informal formative
assessment.

CLOSURE

At the end of the lesson, make sure children understand the main concept of the lesson by asking them to complete the
following problem:
40 + 50 =____
Tens Ones
Children should use a strategy based on the place value to add, such as a place value chart. 5 0
We find the sum of the tens digits together. + 4 0
The model shows the model answer:
9 0

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