Title - Adding Two-Digits
By - Haya ALnaimi
Primary Subject - Math
Grade Level - 1
Qatar standards:
4. add whole numbers and apply this skill to solving routine and non-routine problems.
4.7 use and explain mental method to add, without crossing the tens boundary, supported by a model such as snap cubes or 100 square.
Objectives:
express numbers to 100 as tens and ones by counting.
add two-digit numbers (tens and ones).
Motivation:
Ask children to set on the mat, show them how to model two-digit numbers using snap cubes and tens-and-ones chart.
Ask volunteer to make 23 and another one to make 15.
Use cards to show 23 + 15 =
Ask them to find the total by using the snap cubes.
Procedures:
Ask them to count by tens starting from 10 to 100.
Give examples on the overhead projector: 36 + 22 =
Ask them how many tens and ones are in these numbers.
Give more examples such as: 40 + 59 =
Give each group a problem solving worksheet .
Give each group a white board and pen and ask them to find out the answer, write it and then model it with rods.
Closure:
quick check: how many snap cubes in 5 tens and 3 ones?
an individual problem solving worksheet.
Assessment rubric :
The child correctly uses snap cubes to model the numbers and find the answer.
The child correctly models the number but makes mistakes in the answer.
The child needs guidance to model the number and find the answer.
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