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G OO D M O R N ING

G OO D M O R N ING. 1+ 5. 1 1+ 5=. 1 6. 2+3. 1 2+3 =. 1 5. calculate in ones place. first. 2+3 = 5. 1+ 5= 6. put them together. 5+10=15. second. 6+10=16. Add the number in the ones place first, then add the number in the tens place. pigeon. 5-2=. Use the materials to calculate.

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G OO D M O R N ING

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

  2. pigeon

  3. 5-2= Use the materials to calculate.

  4. Minuend 5 5-2=

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

  6. Use the number line. Method: 1、Find 5. 2、Jump left 2 steps from 5. 5 5-2= 2 3 -2 1 2 3 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 4 0

  7. ones place tens place Minuend 5-2= 5

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

  9. 15-2= Use the materials to calculate. tens frame number lines digit-order-chart

  10. 15 15-2=

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

  12. 5- 2 = 3 +10 +10 15-2=13 in difference in common counters take away counters put at first counters left at the end

  13. Use the number line. Method: 1、Find 15. 2、Jump left 2 steps from 15. 15-2= 2 13 15 -2 -2 1 2 3 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 4 0 5-2= 3

  14. ones place tens place 15-2= 15

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

  16. 5-2= 3 15-2= 13 ones place tens place ones place tens place 5-2=3 first calculate in ones place 3+10=13 second put them together Take away the number in the ones place first, then add the number in the tens place.

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

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

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

  20. Challenge1: Calculate the number sentence and write the process. 8-3= 18-3= 15 first calculate in ones place 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.

  21. 14-3 12-1 ① 4-3 ② 4+3 ① 1- 1 ② 2-1 Challenge2: Find friend Who is their best friend? ① 4-3 ② 2-1

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

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

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

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

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