YEAR 1 Addition Subtraction Crossing 10 1 Subtraction

YEAR 1 Addition & Subtraction – Crossing 10 (1) Subtraction – Crossing 10 (2) Block 1 – Week 3

Lesson 1 Step: Subtraction – Crossing 10 (1)

Fluency 12 - 3 = 9 -3 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20

Fluency 16 - 7 = 9 -7 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20

14 - 6 = 8 -6 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20

Fluency First there were 11 apples. Then 4 were taken away. How many now? 11 - 4 = 7 -4 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20

Fluency First there were 17 cherries. Then 9 were taken away. How many now? 17 - 9 = 8 -9 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20

Fluency First there were 12 pears. Then 7 were taken away. How many now? 12 - 7 = 5 -7 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20

Beth says, The number line represents the subtraction problem. -4 0 1 2 3 4 5 6 7 8 9 10 Do you agree with Beth? Explain your answer No, the number line shows 13 – 4 = 9. It should show 13 – 5 = 8. 11 12 13 14 15 16 17 18 19 20

Problem solving 12 pencils. First there were ______ Then 7 were taken away. Now there are 5. Show this on ten frames.

Lesson 2 Step: Subtraction – Crossing 10 (1)

Recap: Match the bonds to 10. 7 5 4 2 8 6 5 3

Fluency Complete the subtraction using ten frames and a number line. - 12 = 5 2 7 3 10 – 3 = 7 0 1 2 3 4 5 6 7 8 9 12 – 2 = 10 10 11 12 13 14 15 16 17 18 19 20

Fluency Complete the subtraction using ten frames and a number line. - 15 = 9 5 6 4 10 – 4 = 6 0 1 2 3 4 5 6 7 8 15 – 5 = 10 9 10 11 12 13 14 15 16 17 18 19 20

Fluency Complete the subtraction using ten frames and a number line. - 14 = 6 4 8 2 10 – 2 = 8 0 1 2 3 4 5 6 7 8 9 14 – 4 = 10 10 11 12 13 14 15 16 17 18 19 20

Fluency Complete the subtraction using ten frames and a number line. - 18 = 9 8 9 1 10 – 1 = 9 0 1 2 3 4 5 6 7 8 9 10 18 – 8 = 10 11 12 13 14 15 16 17 18 19 20

Fluency Complete the subtraction using ten frames and a number line. - 13 = 8 5 5 3 10 – 5 = 5 0 1 2 3 4 5 6 7 8 13 – 3 = 10 9 10 11 12 13 14 15 16 17 18 19 20

Fluency Complete the subtraction using ten frames and a number line. - 11 = 5 1 6 4 11 – 1 = 10 10 – 4 = 6 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20

Reasoning The ten frames show 15 – 6. True or false? Explain your answer. False. The ten frames show 14 – 7 = 7.

Use the counters below to create a subtraction that will give an answer more than 5 but less than 10. 13 - List the different combinations. Possible answers: 13 – 4 = 9, 13 – 5 = 8, 13 – 6 = 7, 13 – 7 =6. ? = ? Problem solving

Lesson 3 Step: Subtraction – Crossing 10 (1)

Fluency Complete the subtraction using ten frames and a number line. - 13 6 3 3 -3 0 1 2 3 4 5 6 7 8 13 - 3 = 10 10 - 3 = 7 -3 9 10 11 12 13 14 15 16 17 18 19 20

Fluency Complete the subtraction using ten frames and a number line. - 14 5 1 4 1 2 3 4 5 6 7 8 9 4 = 10 10 - 1 = 9 -4 -1 0 14 - 10 11 12 13 14 15 16 17 18 19 20

Fluency Complete the subtraction using ten frames and a number line. - 16 8 2 6 1 2 3 4 5 6 7 8 9 6 = 10 10 - 2 = 8 -6 -2 0 16 - 10 11 12 13 14 15 16 17 18 19 20

Fluency Complete the subtraction using ten frames and a number line. - 18 9 8 1 1 2 3 4 5 6 7 8 9 8 = 10 10 - 1 = 9 -8 -1 0 18 - 10 11 12 13 14 15 16 17 18 19 20

Fluency Complete the subtraction using ten frames and a number line. - 11 8 1 7 -7 0 1 2 3 4 5 6 11 - 1 = 10 10 - 7 = 3 -1 7 8 9 10 11 12 13 14 15 16 17 18 19 20

Fluency Complete the subtraction using ten frames and a number line. - 12 7 2 5 -5 0 1 2 3 4 5 6 7 12 - 2 = 10 10 - 5 = 5 -2 8 9 10 11 12 13 14 15 16 17 18 19 20

Matt says, I had 13 sweets. I gave Gina 6 of them. I still have more sweets than Gina. Is Matt correct? Explain how you know. Matt is correct, he does have more sweets than Gina as 13 – 6 = 7. Matt has 7 sweets and Gina has 6 sweets.

Write a story to represent the subtraction shown on the ten frames. What number sentence represent this? 17 – 9 = 8 17 – 7 = 10 – 2 = 8 Problem solving

Lesson 4 Step: Subtraction – Crossing 10 (2)

Fluency Complete the number sentences. 11 counters. First there were _______ 6 counters were taken away. Then _______ Now there are _______5 counters. 11 - 6 = 5

Fluency Complete the number sentences. 15 counters. First there were _______ 7 counters were taken away. Then _______ Now there are _______8 counters. 15 - 7 = 8

Fluency Complete the number sentences. 14 counters. First there were _______ 8 counters were taken away. Then _______ Now there are _______6 counters. 14 - 8 = 6

Fluency Complete the number sentences. 18 counters. First there were _______ 9 counters were taken away. Then _______ Now there are _______9 counters. 18 - 9 = 9

Fluency Complete the number sentences. There are 15 cars. 15 8 of them are blue. How many are red? _______7 15 - 8 = 7

Fluency Complete the number sentences. There are 17 jumpers. 17 9 of them are blue. _______ 8 of them are red. 17 - 8 = 9

Fluency Complete the number sentences. There are 12 candles. 12 5 of them are blue. _______ 7 of them are red. 12 - 7 = 5

Fluency Complete the number sentences. 17 building blocks. There are _______ 8 of them are blue. _______ 9 of them are red. _______ 17 - 8 = 9 17

Fluency Complete the number sentences. 11 counters. There are _______ 11 3 of them are blue. _______ 8 of them are red. _______ 11 - 3 = 8

Reasoning The three representations below represent 14 minus 5. Spot and explain the mistake. 14 There are 14 counters. 5 of them are blue. 9 of them are red. 14 - 5 The part-whole model shows 9 blue and 5 red counters. It should show 5 blue and 9 red counters. = 9

Complete the part-whole model to represent the subtraction. 15 What other ways can you show the subtraction? Problem solving

Lesson 5 Step: Subtraction – Crossing 10 (5)

Fluency Mo has 12 apples. 12 - Jack has 4 apples. 4 How many more apples does Mo have? _______ 8 12 Mo Jack 4 8 = 8

Fluency Tam has 11 pears. 11 - Gina has 3 pears. 3 How many more pears does Tam have? _______ 8 11 Tam Gina 3 8 = 8

Fluency Jack has 10 sweets. 10 - Beth has 7 sweets. 7 How many more sweets does Jack have? _______ 3 10 Jack Beth 7 3 = 3

Fluency Dom has 14 cakes. 6 cakes. Ben has _______ 14 - Dom has 8 more cakes than Ben. 14 Dom Ben 6 8 6 = 8

Fluency 13 lollies. Che has _______ Asha has 8 lollies. 13 - 8 Che has 5 more lollies than Asha. 13 Che Asha 8 5 = 5

Reasoning The bar model shows the following calculation: 14 - 8 = True or false? Explain your answer. 6 14 6 True, the bar model shows 14 – 8 = 6. It also shows 14 – 6 = 8. 8

The following calculations have been worked out: 11 – 4 = 7 15 – 11 = 4 What is the question? What is the answer? (11 – 4) How many more red apples are there? (15 – 11) There are 15 apples. 11 are red. How many are green?