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Oral calculation.

4+6=. 5+ =9. 3+4=. 2+8=. 10-0=. -7=3. 10. 10. 10. 10. 4. 7. Oral calculation. Guess the number. It's more than 10. It's less than 12. 11. What number is it ？. Using the sticks to show the number. tens. ones. Tie these ten sticks together in a bundle.

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Oral calculation.

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  1. 4+6= 5+ =9 3+4= 2+8= 10-0= -7=3 10 10 10 10 4 7 Oral calculation.

  2. Guess the number It's more than 10. It's less than 12. 11 What number is it？

  3. Using the sticks to show the number tens ones Tie these ten sticks together in a bundle. What's the relationship bewteen 10 and 11? 1ten 1one and makes 11 10 ones is 1ten 10 ones digital order table 1 ten 1one 1 1 1 1 10+1=11

  4. tens ones How many sticks? 1 ten and 9 onesmakes 19 1 ten and 3 onesmakes 13 1 ten and 5 onesmakes 15 1 ten and 2 onesmakes 12 digital order table How do we put the number 12 into the table? Firstly,we put a “1” in the tensplace to stand for 1 ten ; Then,put a “2”in the ones place to stand for 2 ones. 1 ten and 2 ones makes 12. 1 5 3 1 1 1 2 9

  5. tens ones How many sticks? Tie these ten sticks together in a bundle. digital order table 2 tens makes 20 The number in the ones place means how many ones, and the number in the tens place means how many tens. 2 0

  6. tens ones Exercise 1、Put them in the digital order table. 2、Write the number sentences. 12、17、14、20 1 2 10+2=12 1 2 12 ____ten and _____ones in ___

  7. tens tens ones ones （）tens and ( ) ones （）tens and ( ) ones

  8. tens tens ones ones （）tens and ( ) ones （）tens and ( ) ones

  9. Calculation. 10+（ ）=18 14-4= 10+1= 12-（ ）=10 19-9= 10+3= （ ）+10=20 16-6= 6+10= 11=10+（ ） 15-5= 10+10=

  10. 7 17 0 10 3 10 Completethe part and whole models. 14 15 9 10 4 10

  11. Filling the blanks. 1、 eight ones and one ten is( ) 2、If 1 in the tens place,and 3 in the ones place,do you know the number? 3、20 has ( )tens. 20 has ( ) fives. 20 has ( ) ones.

  12. 4、17 is a two-digital-number, it's 1 less than( ),and 3 more than ( ) . 5、Minium two-digital-number is ( ). Maximal one-digital-number is ( ). Add them we can get ( ) 6、If 1 in the tens place, a even number in the ones place, and it's much more than 15,but little less than 20, do you know the number?( )

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