Addition – lesson plan
Ma2, 1b, 2b, 3d, 3e.
- Show the following Number bonds to 5 song. singing and learning the song.
- Remind the children of previous work on number bonds.
- Revise number bonds to 10 by giving the children a number card between 0 and 10.
- Play some music and ask the children to move around the classroom trying to find their partner to 10. By the time the music stops they should be standing with their partner. If there is an odd number of children the teacher will also need a card.
- Use the known facts on bonds to 10 to practise bonds to 20.
- Discuss speedy mental methods to find bonds of bigger numbers.
- Explain to the children that knowing bonds to 10 and 20 can help with bonds to 30 and 40. Show that it is the number of tens that change (e.g. 6 + 4 = 10, 16 + 4 = 20, 16 + 14 = 30, 26 + 14 = 40).
- Ask the children to get into pairs and quickly find a bond to 10, 20, 30 and 40 on their whiteboards or jotters, keeping the original bond to 10 the same. They can discuss the task with their partner.
Lower ability – Place the 0 to 20 number cards in a rice or sand tray. Ask the children to pick a card out of the tray and find its corresponding number bond to 20. They can use counters to help them. Play the Crossing the Swamp game (addition).
Middle ability – Play the Bitesize addition game in groups. Start by showing the children how to repair the slide by using bonds to 20.
Higher ability – Draw a ‘number bond machine’ on the board. Write 100 in the middle of the machine. On the left, write a 2-digit number that is going into the machine. On the right, leave a space for the answer. Invite the children to come up and write the machine’s answer on the board. How did they work out the bond to 100 using their knowledge of bonds to 10? Repeat the activity, finding different number bonds to 100.
Play the Bitesize addition game again but this time let the different groups demonstrate and explain how they calculated the bonds and then show how they repaired the slide. Did other groups calculate their bonds in a different way?
Ask the children to investigate the different ways of making 100 using 2 digits. Can they write them out in numerical order (eg 1 + 99 = 100, 2 + 98 = 100, 3 + 97 = 100, and so on)?