GOOD MORNING 11+5= = calculate in ones place first

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Presentation transcript:

GOOD MORNING 11+5= 1+5 16 12+3= 2+3 15 calculate in ones place first 1+5=6 2+3=5 put them together second 6+10=16 5+10=15 Add the number in the ones place first, then add the number in the tens place.

pigeon

5-2= Use the materials to calculate.

Minuend 5 5-2=

5-2= 2 3 Method: 1、Put 5 circles in the frame. 2、Take away 2 circles. Difference 5-2= 2 3 Subtrahend

5 5-2= 2 3 Use the number line. Method: 1、Find 5. 2、Jump left 2 steps from 5. 5 5-2= 2 3 -2 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20

tens place ones place Minuend 5 5-2=

5-2= 2 3 Method: 1、Put 5 circles in the chart. 2、Take away 2 circles. tens place ones place Difference 5-2= 2 3 Subtrahend

15-2= Use the materials to calculate. tens frame number lines digit-order-chart

15 15-2=

15-2= 2 13 Method: 1、Put 15 circles in the frame. 2、Take away 2 circles. 15-2= 2 13

5- 2 = 3 15-2=13 +10 +10 in difference in common counters take away counters put at first counters left at the end

15-2= 15 2 13 Use the number line. Method: 1、Find 15. 2、Jump left 2 steps from 15. 15-2= 15 2 13 -2 -2 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 5-2= 3

tens place ones place 15 15-2=

15-2= 2 13 Method: 1、Use circles to express 15 in the chart. 2、Take away 2 circles. tens place ones place 15-2= 2 13

5-2= 3 15-2= 13 ones place tens place ones place tens place first 5-2=3 calculate in ones place second 3+10=13 put them together Take away the number in the ones place first, then add the number in the tens place.

Challenge1: Calculate the number sentence and write the process. 17-5= 15-4= 18-3=

Challenge1: Calculate the number sentence and write the process. 17-5= 7-5= 12 calculate in ones place first 7-5=2 put them together second 2+10=12

Challenge1: Calculate the number sentence and write the process. 15-4= 5-4= 11 calculate in ones place first 5-4=1 put them together second 1+10=11

Challenge1: Calculate the number sentence and write the process. 18-3= 8-3= 15 calculate in ones place first 8-3=5 put them together second 5+10=15 Take away the number in the ones place first, then add the number in the tens place.

Challenge2: Find friend Who is their best friend? 14-3 ① 4-3 ② 4+3 ① 4-3 ② 4+3 ① 4-3 12-1 ① 1- 1 ② 2-1 ② 2-1

Challenge2: 18-12=? Calculate the number sentences. 18-2= 17-5= 8-2 16 18-2= 17-5= 8-2 16 7-5 12 18-12=?

Challenge3: Calculate the number sentences according to the pictures. - = - =

× × Challenge4: 17-2= （） True or False. David wants to find the result of 17-2= （） × 6 tens place ones place ×

Challenge5: 15 -7= 13 17-7=10 18-7=11 19-7=12 13 15 - 7= 15-5=10 15-4=11 15-3=12 15-2=13 15-1=14 15-0=15 What can the number sentences probably be?