Lesson 38a: Friends of 10 on an abacus
Level 4, Big Friends Bridge. Find each number's big friend, on the beads and on your fingers.
What your child does, card by card
Friends of 10. Two numbers that make 10 together. PlayType opens the lesson: “Big friends make ten together.”
After 9 comes 10: the rod is full at 9. One more makes 10. Yellow marks the ones rod and the tens rod while the kids talk about them. The abacus makes 6, then clears. “Full at 9” and “9 and 1 more = 10” glow on the card in step with the beads. The card ends on a touch: “So 9 and 1 make 10.”
9 and 1. 8 and 2. 7 and 3.: how many more to make 10? The beads show 9, 8 and 7 and go back to zero. Above, “9 and 1”, “8 and 2” and “7 and 3” take turns to glow. Its words: “Count the hops.”
6 and 4. 5 and 5.: 5 and 5 are twins. 6 and 5 appear on the beads, then the rod clears again. The labels “6 and 4” and “5 and 5” light up as each idea comes. “Count the hops again.” Any bead or finger may be tapped afterwards.
Friends of 10: 9, 8, 7, 6 and 5 appear on the beads one at a time; your child answers on the fingers with the number that makes 10 (9 and 1, 8 and 2, 7 and 3, 6 and 4 and 5 and 5).
Try it: your child goes from 9 to 10, goes from 8 to 10 and goes from 7 to 10, with a green ring on the next bead to move.
In Copy me the drawn hand holds up 10, 9, 8 and 10 in turn, and your child copies each one in beads.
Big friends, mixed up: the beads show 7, 9, 5, 6, 8, 1, 2 and 3 in turn and hold still, and your child shows each one's friend on the drawn fingers, so 7 and 3, 9 and 1, 5 and 5, 6 and 4, 8 and 2, 1 and 9, 2 and 8 and 3 and 7 each make 10.
In your head: the beads flash 9, 10 and 7, one at a time, for 1.5 seconds each and hide; your child shows each number on the drawn fingers, then sees the beads again.
You're ready! 9 and 1. 8 and 2. 7 and 3. 6 and 4. 5 and 5. They make 10.
What this lesson trains
23 answers, roughly five minutes: 15 moves of the beads, 5 of them with the top bead and 10 with bottom beads. Up to 10, read and set from the left. Then 3 quick looks in your head.
It starts with doing: go from 9 to 10, go from 8 to 10 and go from 7 to 10.
Fingers and hands
Below the abacus the drawn hands show zero and 1, 2, 3, 4, 5, 6, 7, 8, 9 and 10 here, finger for bead: the left hand counts the tens, the right hand the ones.
In Copy me the hand leads with 10, 9, 8 and 10 and your child turns each into beads.
What PlayBuddy and PlayType say
PlayType: “Big friends make ten together.”
PlayBuddy: “Seven, eight, nine. Every bead is on the bar. This rod is full!”
PlayType: “One more? There is no room! So the nine beads go back, and one bead goes up on the next rod.”
PlayBuddy: “Nine and one. Eight and two. Seven and three.”
PlayBuddy: “The big friend of five is five. They are twins.”
Stars
23 answers: 2 slips still give three stars; up to 5, two stars.