Addition Subtraction Add by counting on Number bonds

Addition & Subtraction Add by counting on Number bonds to 20 Block 1 – Week 1

Lesson 1 Step: Add by counting on (1)

8 apples. First there were _____ 6 more were added. Then _____ Now there are _____ 14 apples.

9 sweets. First there were _____ 3 more were added. Then _____ 12 sweets. Now there are _____

10 doughnuts. First there were _____ 5 more were added. Then _____ 15 doughnuts. Now there are _____

Reasoning I start with 9 sweets. Then I get 8 more. I now have more than 18 sweets. True or false? False. 9 + 8 = 17 (which is less than 18).

How many apples should be in the ‘Then’ box? What calculation shows this: ______ 8+ ______ = 3______ 11

Lesson 2 Step: Add by counting on (2)

First Then 8 First there were _____. 7 more were added. Then _____ 15 Now there is _____. Now Fluency

First Then 9 First there were _____. 4 more were added. Then _____ 13 Now there is _____. Now Fluency

First Then 5 First there were _____. Then 12 _____ more were added. 17 Now there is _____. Now Fluency

Fluency How many more to make 10? 0 1 2 3 4 5 6 6 + ______4= 10 ______ 7 8 9 10

Fluency How many more to make 10? 0 1 2 3 4 5 6 3 + ______7= 10 ______ 7 8 9 10

Fluency How many more to make 20? 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 14 + ______6= 20 ______

Fluency How many more to make 20? 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 9 + ______11= 20 ______

Fluency How many more to make 20? 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 3 + ______17= 20 ______

Reasoning Spot and explain the mistake. 6 + 8 = 14 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 The jumps on the number line show 8 + 6. It should show 6 plus 8 more.

Complete the ‘Then’ box and complete the number sentence. First Then 7 + ______5= ______ 12 ______ Now Problem solving

Lesson 3 Step: Number bonds to 20 (1)

Fluency 8 black counters. There are _____ 12 red counters. There are _____ Altogethere are _____20 counters. 8 + _____12= _____ 20 _____ 8 _____ +12 _____ = _____ 20

Fluency 4 black counters. There are _____ 16 red counters. There are _____ Altogethere are _____20 counters. 4 + _____16= _____ 20 _____ 4 _____ +16 _____ = _____ 20

Fluency 11 black counters. There are _____ 9 red counters. There are _____ Altogethere are _____20 counters. _____ 11 + _____9= _____ 20 _____ + 9_____ = _____ 11 20

Fluency 18 black counters. There are _____ 2 red counters. There are _____ Altogethere are _____20 counters. 18 + _____2= _____ 20 _____ 18 _____ + 2_____ = _____ 20

Reasoning There are 9 black counters. There are 5 red counters. Altogethere are 15 counters. True or false? Explain how you know. False. There are 9 black counters and 6 red counters (not 5).

There are 4 more red counters than black counters. The total is 20. How many of each colour counter are there? Show this on ten frames and as number sentences. 8 + 12 = 20 12 + 8 = 20 Problem solving

Lesson 4 Step: Number bonds to 20 (2)

Create bonds to 10 using the two frames. 3 and _____7 make _____ 10 is made of _____ 3 and _____ 7 _____ 3 + _____7= _____ 10 10 - _____3 = _____ 7 + _____3= _____ 10 10 - _____ 7 = _____ 3 _____

Create bonds to 10 using the two frames. 6 and _____4 make _____ 10 is made of _____ 6 and _____ 4 _____ 6 + _____4= _____ 10 10 - _____6 = _____ 4 + _____6= _____ 10 10 - _____ 4 = _____ 6 _____

Create bonds to 20 using the two sets of frames. 13 and _____7 make _____ 20 is made of _____13 _____ and _____ 7 _____ 13 + _____7= _____ 20 20 - _____ 13= _____ 7 + _____13= _____ 20 20 - _____ 7 = _____ 13 _____

Create bonds to 20 using the two sets of frames. 5 and _____15 make _____ 20 is made of _____ 5 and _____ 15 _____ 5 + _____15= _____ 20 20 - _____5 = _____ 15 + _____5= _____ 20 20 - _____ 15 = _____ 5 _____

Create bonds to 20 using the two sets of frames. 2 and _____18 make _____ 20 is made of _____ 2 and _____ 18 _____ 2 + _____18= _____ 20 20 - _____2 = _____ 18 + _____2= _____ 20 20 - _____ 18 = _____ 2 _____

Create bonds to 20 using the two sets of frames. 14 and _____6 make _____ 20 is made of _____14 _____ and _____ 6 _____ 14 + _____6= _____ 20 20 - _____ 14= _____ 6 + _____14= _____ 20 20 - _____ 6 = _____ 14 _____

The number frames represent the number sentences represent a bond to 20. + True or false? Explain how you know. False, the number frames show 4 and 18. This makes 22 (not 20). How could this be corrected? Change the 8 -piece to a 6 -piece or the 4 -piece to a 2 -piece. Reasoning

How many number bonds to 20 can you make using the number frames below? You may combine and use the number frames more than once. 10 + 10 = 20 17 + 3 = 20 3 + 17 = 20 13 + 7 = 20 7 + 13 = 20

Lesson 5 Step: Consolidation

Fluency Complete the part-whole models to show bonds to 10. 10 4 10 6? 8? 2

Fluency Complete the part-whole models to show bonds to 20. 20 5 20 15 ? 8? 12

Fluency Complete the part-whole models to show bonds to 20. 20 1 20 ? 19 7? 13

Fluency Complete the part-whole models to show bonds to 20. 20 9 20 11 ? 6? 14

Fluency Complete the part-whole models to show bonds to 10. 20 3 20 17 ? 2? 18

The part-whole model shows a number bond to 20. Reasoning What mistake has been made? The whole and a part has been mixed up. The whole should be 20 and the part should be 3 3 17 20 How could this be corrected? Swap the 3 and 20 round so that 20 is the whole and the parts are 17 and 3.

Problem solving How many different ways can you complete the part-whole model below to show bonds to 20? There are 21 different part-whole models that can be made: 20 ? ? 0, 1, 2, 3, 4, 5, 20 19 18 17 16 15 6, 14 7, 13 8, 12 9, 11 10, 10 11, 9 12, 13, 14, 15, 16, 17, 8 7 6 5 4 3 18, 2 19, 1 20, 0