YEAR 1 Addition Subtraction Add by making 10

YEAR 1 Addition & Subtraction Add by making 10 Subtraction – Not crossing 10 Block 1 – Week 2

Lesson 1 Step: Adding by making 10 (1)

Recap: Complete the table to show number bonds to 10. Part 1 1 8 5 7 7 1 4 8 4 10 Part 2 9 2 5 3 3 9 6 2 6 0 Fluency

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

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

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

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

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

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

Reasoning The number line below shows 3 + 9. +3 0 1 2 3 4 5 6 7 8 9 True or false? Explain how you know. False. The number line below shows 9 + 3. 10 11 12 13 14 15 16 17 18 19 20

Use the counters below to complete the two calculations. 7_______ + _______ 5 = _______ 12 5_______ + _______ 7 = _______ 12 Problem solving

Lesson 2 Step: Adding by making 10 (2)

Fluency Kat has 5 sweets. She gets 7 more. How many altogether? 5 + 5 7 = 2 12 so 10 + 2 = 12

Fluency Matt has 8 pens. He gets 6 more. How many altogether? 8 + 2 6 = 4 14 so 10 + 4 = 14

Fluency Sue has 4 beads. She gets 7 more. How many altogether? 4 + 6 7 = 1 11 so 10 + 1 = 11

Fluency Dom has 6 apples. He gets 9 more. How many altogether? 6 + 4 9 = 5 15 so 10 + 5 = 15

Fluency Jess has 9 stickers. She gets 8 more. How many altogether? 9 + 1 8 = 7 17 so 10 + 7 = 17

Reasoning Ben has created a part-whole model for 7 + 9. What mistake has Ben made? 18 7 The total is incorrect. The whole should show 16. 9 7 + 9 = 16 (not 18).

Problem solving How many different addition calculations can you make that give the answer 11? Use the number line to help you. 0 1 2 0 + 11, 11 + 0, 3 4 5 1 + 10, 10 + 1, 12 combinations. 6 7 8 2 + 9, 9 + 2, 9 10 11 3 + 8, 8 + 3, 12 13 14 15 4 + 7, 7 + 4, 16 17 18 5 + 6, 6 + 5. 19 20

Lesson 3 Step: Subtraction (not crossing 10)

Fluency First there were 14 counters. Then 2 were taken away. How many now? FIRST THEN NOW 14 - 2 = 12

Fluency First there were 16 counters. Then 3 were taken away. How many now? FIRST THEN NOW 16 - 3 = 13

Fluency First there were 17 counters. Then 6 were taken away. How many now? FIRST THEN NOW 17 - 6 = 11

Fluency First there were 18 counters. Then 5 were taken away. How many now? FIRST THEN NOW 18 - 5 = 13

Fluency First there were 19 counters. Then 7 were taken away. How many now? FIRST THEN NOW 19 - 7 = 12

Fluency First there were 20 counters. Then 7 were taken away. How many now? FIRST THEN NOW 20 - 7 = 13

Reasoning Which calculation represents the table below? FIRST THEN NOW A) 18 – 6 = 12 B) 18 – 5 = 13 C) 18 – 7 = 11 Can you write a story to represent this?

Kat’s answer in the NOW box is between 10 and 12. What is her calculation? FIRST THEN Kat’s calculation is 17 – 6 = 11. NOW Problem solving

Lesson 4 Step: Subtraction (not crossing 10)

Fluency Beth has 18 marbles. She gives 6 away. How many are left? 18 18 6 12 - 6 = 12

Fluency Ben has 15 pens. He gives 3 away. How many are left? 15 15 3 12 - 3 = 12

Fluency Kat has 19 beads. She gives 8 away. How many are left? 19 19 8 11 - 8 = 11

Fluency Mo has 18 marbles. He gives 3 away. How many are left? 18 18 3 15 - 3 = 15

Fluency Sue has 20 cakes. She gives 7 away. How many are left? 20 20 7 13 - 7 = 13

Fluency Ben has 19 sweets. He gives 5 away. How many are left? 19 19 5 14 - 5 = 14

Which number line represents the number frames? -6 A) 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 -8 - B) 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 -6 C) 0 1 2 3 Explain how you know. C is correct as it shows 18 – 6 = 12 4 5 6 7 8 9 10 11 12 13 14 15

Complete the table and calculation. 5 = _______ 17 12 _______ - _______