10 's multiplication.

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Presentation transcript:

10 's multiplication

Review: write down the multiplication sentence 5 (threes) 4 (sixes) 7 (eights) 9 (twos) 1 (five) 5×3 4×6 7×8 9×2 1×5

Review: write down the multiplication sentence 8+8+8+8 6+6+6 4+4+4+4+4 3+3+3+3+3+3 7+7+7+7+7+7+7+7 4×8 3×6 5×4 6×3 8×7

Number line 10 10

Jump on the number line Jump for 10 scales each time

Jump on the number line Jump for time(s),jumped to___, (tens) seven 10 20 30 40 50 60 70 80 90 100 0(ten) 2(tens) 4(tens) 6(tens) 10(tens) 8(tens) 1(ten) 3(tens) 5(tens) 7(tens) 9(tens) Jump for time(s),jumped to___, (tens) seven eight ten three four zero nine five six one two 10 90 20 50 60 70 80 2 9 5 1 100 40 30 10 4 6 7 3 8 3×10=30 1×10=10 2×10=20 9×10=90 10×10=100 7×10=70 4×10=40 6×10=60 0×10=0 5×10=50 8×10=80

10 's multiplication

10's mutiplication 0×10=0 1×10=10 2×10=20 3×10=30 4×10=40 5×10=50 6×10=60 7×10=70 8×10=80 9×10=90 10×10=100

When a number is multiplied by 10, the product is to put a 0 at the end of this number.

40=( )×10 4 50=10 ×( ) 5 10=( )× 10 ( ) × 10=90 0=( )× 10 20=10 ×( ) Fill in the blanks 40=( )×10 4 50=10 ×( ) 5 10=( )× 10 1 ( ) × 10=90 9 0=( )× 10 20=10 ×( ) 2 10 × ( )=100 10

calculate 10× = 10 1 9 40 ×10= 20 60 5 8 2 100 50 10 80 90 4 6

Ten pencils a bundle ,how many pencils are there in ten bundles? × = 10 10 100

The workman wants to tile 5 rows, every row has 10 tiles, how many tiles will he need all together ? number sentence:_______________ 5×10=50

4 (tens) 7 How many pencils? Can you use the multiplication sentence? 4×10 + 7 = 47 40 + 7 = 47

5(tens) 5×10 -3 = 47 How many pencils? Can you use the multiplication sentence? borrow 3 pencils,makes 10 5(tens) 5×10 -3 = 47 50 - 3 = 47

In a number sentence with a multiplication and an addition or with a multiplication and a subtraction, you should do the multiplication first and then the addition or subtraction.

Calculate 0×10= 10×3= 40= ×10 50=10× 30 4 5

Challenge (1) 8×10+7= (2)9×10-8= +7= -8= 7×10+4= 10×6-7= +4= -7= 87 82 80 87 90 82 53 74 70 74 60 53

What did we learn today?