Multiply by 1 and 0 Year 4 Multiplication and Division Learning Video Clip

Step 5: Multiply by 1 and 0 Year 4 Multiplication and Division Learning Video Clip

Hamish is competing in the biathlon and Syeda has come along to support him. Your help is needed to prepare the equipment, calculate shooting scores and organise the leaderboard using knowledge of multiplying numbers by one and zero.

More resources for Autumn Block 4 Step 5.

Not a member? Sign up here.

Discussion points for teachers

1. Who is correct?
Discuss which information is important to form a calculation to work out an answer.
Syeda is correct because she has multiplied 18 by 1.

2. What mistake did the organiser make?
Discuss why Syeda is correct and why the method (addition) chosen by the organiser has led him to the incorrect answer.
The organiser is incorrect because he has used addition instead of multiplication.

3. In round one, how many points did he score?
Discuss the order in which the three numbers could be multiplied together.
Hamish scored 40 points: 8 x 5 x 1 = 40.

4. How many points did Hamish score in round two?
Discuss the order in which the three numbers could be multiplied together. Discuss what multiplying by zero means.
Hamish scored 0 points: 4 x 0 x 9 = 0.

5. In round three, Hamish scored more points than round two but fewer than round one. How many points could Hamish have scored for shot 3?
Discuss the possible value of the missing point score, including the smallest and greatest possible value. Discuss why the point score cannot be zero. This question is open-ended for children to explore.
Various answers, for example: if the missing point were to be 3, the total would be 5 x 1 x 3 = 15. The missing point could be any value from 1 to 7.

6. The organisers are really cold and have made some mistakes when calculating the points totals. Help Hamish and Syeda correct the points totals.
Discuss the order in which the numbers can be calculated and the possible errors the organisers have made in their calculations.
8 x 12 x 0 = 0, 1 x 90 = 90, 8 x 11 x 1 = 88, 84 x 1 = 84, 10 x 12 x 1 = 120.

7. Put the points totals in order to find out which athlete won the biathlon.
Discuss place value and the language of ordering including ascending and descending.
5th place: Seymour Medals 0 points, 4th place: Miles Behind 84 points, 3rd place: Buster Record 90 points, 2nd place: Ivanna Win 88 points and 1st place Hamish 96 points.

Optional discussion points:
Link to geography. Discuss which country each athlete is from by looking at the flags of the competitors on the scoreboard and possibly using an atlas to find their origin.

National Curriculum Objectives

Mathematics Year 4: (4C6b) Use place value, known and derived facts to multiply and divide mentally, including: multiplying by 0 and 1; dividing by 1; multiplying together three numbers

Mathematics Year 4: (4C8) Solve problems involving multiplying and adding, including using the distributive law to multiply two digit numbers by one digit, integer scaling problems and harder correspondence problems such as n objects are connected to m objects

This resource is available to play with a Premium subscription.