(Warm Up)Oral calculation. 2 + 4 8 - 1 1 + 6 7 - 5 5 + 2

10-game

please find the missing numbers. All of the answers are 10, please find the missing numbers.

○○○○○ 5+□=10

Colour the circles with blue and red . ○○○○○ 5+□=10 5

○○○○○ □+1=10

Colour the balls with blue and red . ○○○○○ □+1=10 9 1+ 9=10

please find the missing numbers. All of the answers are 10, please find the missing numbers. Are there any other addition number sentences with the result “10”? 5 9 8 6 4 3 1 7 10 2

1+9=10 1+9=10 9+1=10 2+8=10 2+8=10 8+2=10 3+7=10 3+7=10 7+3=10 4+6=10 Friends make 10 1+9=10 1+9=10 9+1=10 1 and 9,hand in hand; 2 and 8,walk together; 2+8=10 2+8=10 8+2=10 3 and 7,back to back; 3+7=10 3+7=10 7+3=10 4 and 6,head to head; 4+6=10 4+6=10 6+4=10 5 and 5,wave wave wave. 5+5=10 5+5=10 Change the positions of two addends, sum remains unchanged.

Exercise 1 Please select two numbers from 1, 2, 3, 4, 5, 6, 7, 8, 9, to add , and the answer is 10. □+□=10 □+□=10 3 7 7 3

At the beginning, there are 10 bottles of juice, but now only 8 bottles left. How many empty bottles? 10- □ =8

10- □ =8 2 2+8=10 We can use addition to solve problems of subtraction. 10- □ =6 4 4+6=10

Exercise 2 Fill in the blanks 5 + □ =10 10－ □ = 5 7+ □ =10 10－ □ =7 □ +6=10 10－□ =6 □ + □ =10 10－□ = □ 5 5 3 3 4 4

Can you write down two more number sentences by this picture? ○○○○○ 9+1=10 10-1=9 1+9=10 10-9=1

□+□=10 □+□=10 10-□=□ 10-□=□ Exercise 3 3 7 7 3 3 7 7 3 Please select two numbers from 1, 2, 3, 4, 5, 6, 7, 8, 9, to compose four number sentences. □+□=10 □+□=10 3 7 7 3 10-□=□ 10-□=□ 3 7 7 3

Alex， Emma and Poppy， each one had 10 balls and wanted to throw balls into the barrel, let's have a look, who did best? Emma Alex Poppy

Emma Alex Poppy Balls in all = Balls outside + Balls inside 10 = 2 + □ 8 10 = 3 + □ 7 10 = 4 + □ 6 An addend add 1,another addend minus 1,Sum keeps unchanged.

Alex Emma Poppy Alex did best.

Shopping Activities Rubber glue scissors ruler ￡ 1 ￡ 2 ￡ 5 ￡ 4 pencil pencil box crayon ￡ 3 ￡ 9 ￡ 10

I want to buy: Number sentence: rubber pencil case 1+9=10

Today we played 10-game. Do you have a good time?