Year 2 Maths Lesson Presentation: Multiply by 1 and 0 PDF

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To enter slide show mode, go to the slide show menu tab and select either from beginning or from current slide. You may wish to delete this slide before beginning the presentation.  Maths Multiplication and Division Maths | Multiplication and Division |Mental Calculations | Lesson 1 of 3: Multiply by 1 and 0 Need a coherently planned sequence of lessons to complement this resource? See our Steps to Progression document. Twinkl PlanIt is our award-winning scheme of work with over 4000 resources.  Aim Aim To multiply whole numbers by 1 and 0. Success Criteria Success Criteria Statement I can multiply a whole 1 Lorem number ipsum byamet, dolor sit 1. consectetur adipiscing elit. I can multiply a whole number by 0. Statement 2 I can notice Sub the effect when multiplying by 1. statement I can notice the effect when multiplying by 0. Remember It You will be given two minutes to answer as many of the questions you can. Write down the answers. 2×4= 8 5×9= 45 8×8= 64 0×4= 0 3×3= 9 8×4= 32 2×9= 18 3×7= 21 5×7= 35 5×6= 30 9×2= 18 5×4= 20 10 × 2 = 20 1×8= 8 6×5= 30 4×7= 28 8×1= 8 5×5= 25 1×5= 5 0 × 10 = 0 7×4= 28 8×3= 24 0×8= 0 2×4= 8 6×3= 18 5×8= 40 2×8= 16 3 × 10 = 30 4×7= 28 3×3= 9 2 × 10 = 20 9×4= 36 Extra Challenge: Write as many times table calculations as you can where the answer is an odd number. Multiply by 1 What can you see? There are 5 cups. Each cup has 1 spoon in it. There are 5spoons altogether. Can you write two multiplication equations to represent this picture? 1×5=5 Or, as multiplication is commutative, we could write : 5×1=5 Multiply by 1 There is 1 cup. The cup has 5 spoons in it. There are 5spoons altogether. Will the multiplication equations be 1×5=5 the same as the previous picture? Or, as multiplication is commutative, we could write Yes! 5×1=5 Multiply by 1 Complete the sentences/equations to represent the picture. There are 7 houses. Each house has 1 door. There are 7doors all together. 1×7=7 or 7×1=7 Multiply by 1 Draw your own pictures to represent: Lucy drew these pictures. 1×4=4 3×1=3 Match them to the 4×1=4 1×3=3 multiplication equations. 1×8=8 8×1=8 Multiply by 0 There are 5 cups. Each cup has 0 spoons in it. There are 0spoons all together.. 0×5=0 or 5×0=0 Multiply by 0 Complete the sentences/equations: There are 8 goldfish bowls. Each bowl has 0 fish in it. There are 0 fish all together. c 0×8=0 or 8×0=0 Factors and Products factor factor product 3 × 1 = 3 Which numbers are the factors and which is the product? factor × factor = product Factors and Products Copy and answer these calculations and label the factors and products: factor factor produ produ factor factor ct ct 9 × 1 = 9 7 = 1 × 7 factor produ factor ct 11 × 1 =1 1 Factors and Products What is the same in each of these calculations? facto facto facto r r r facto facto facto product product product r r r 9 × 1 = 9 11 × 1 =11 7 = 1 × 7 Which of these sentences are correct? In each calculation, one of the factors ✓ is 1. In each calculation, the product is the same as both of the factors. ✓ In each calculation, the product is the same as one of the factors. ✓ 1. In each calculation, one of the factors is not In each calculation, the product is greater than both of the factors. Factors and Products facto facto facto r r r facto facto facto product product product r r r 9 × 1 = 9 11 × 1 =11 7 = 1 × 7 Which of these statements is correct? When multiplying two numbers where one of the factors is 1, the product is equal to the other factor. ✓ When multiplying two numbers where one of the factors is 1, the product is also 1. 9 × 1 = 9 11 × 1 =11 7 = 1 × 7 Factors and Products Copy and answer these calculations and label the factors and products: factor factor produ produ factor factor ct ct 4 × 0 = 0 0 = 0 × 9 factor produ factor ct 11 × 0 =0 Factors and Products facto facto facto r r r facto facto facto product product product r r r 4 × 0 = 0 10 × 0 =0 0 = 0 × 9 Which of these statements is correct? In each calculation, one of the factors ✓ is 0. In each calculation, the product is smaller than both of the factors. In each calculation, the product is the same as both of the factors. In each calculation, the product is✓0. ✓ 0. In each calculation, one of the factors is not Multiply 3 Factors facto facto facto r r r facto facto facto product product product r r r 4 × 0 = 0 10 × 0 = 0 0 = 0 × 9 Which of these statements is correct? When multiplying two numbers where one of the factors is 0, the product is the same as the factor that is not 0. When multiplying two numbers where one of the factors is 0, the product ✓ is 0. 4 × 0 = 0 10 × 0 =0 0 = 0 × 9 Multiply 3 Factors Let’s multiply 3 factors together: 4×1×2= 4 × = 2 8 Does it matter which order the factors are in? 4×2×1= 1×2×4= 1×4×2= 2×1×4= 8 × = 2 × = 4 × = 2 × = 1 8 4 8 2 8 4 8 Whichever order the factors are, the product (answer) is always the same. Multiply 3 Factors Would all these 5 × 1 × 4 = 20 Which method methods give would you use? the correct Explain why to I prefer to multiply the answer? your partner. factors which aren’t 1 first, then multiply by 1. I like to multiply the largest factor by 1, then by the remaining factor. Suzy Carl I prefer to multiply the factors in the order they are written. I like to multiply the smallest factor by 1, then by the remaining factor. Tim Anna Multiply 3 Factors Use your favourite method to calculate the answers: 18 3×1×6= 5 × 5 × 25 1= 1 × 824 ×3= 6 8 30 2×3×1= 4×2×1= 10 × 1×3= Multiply 3 Factors Let’s multiply 3 factors together, where one of the factors is 0: 5×0×2= What do you think the answer will be? The answer will always be 0, if any of the factors are 0. Let’s check: 5×0×2= 0×2 0 = It doesn’t matter what order the factors are, if there is a 0, the answer will always be 0. Multiply 3 Factors Use your favourite method to calculate the answers: 4 × 2 × 1 =8 0 × 3 × 100 = 1 × 714 ×2= 0 0 20 5×0×9= 6×2×0= 1×4 ×5= When one of the factors is 0, the When there are 3 factors and product is always 0. This is true, one of the factors is 1, the no matter how many factors product is equal to the product there are. of the other factors. Multiplying by 1 & 0 Activity Sheets Diving into Mastery Dive in by completing your own activity!  Aim Aim To multiply whole numbers by 1 and 0. Success Criteria Success Criteria Statement I can multiply a whole 1 Lorem number ipsum byamet, dolor sit 1. consectetur adipiscing elit. I can multiply a whole number by 0. Statement 2 I can notice Sub the effect when multiplying by 1. statement I can notice the effect when multiplying by 0.