### Teaching and Group Activities for Understanding

**Day 1 Teaching**Use a 1-100 bead bar to show children how to locate 2-digit numbers by identifying the 10s either side. Children repeat on bead strings. Then demonstrate locating and writing numbers on a beaded number line and a landmarked number line.

**Group activities**

Use the in-depth problem-solving investigation ‘100 Square Jigsaw’ from NRICH as today’s group activity.

Or, use these activities:

**-- Most children roll two 1-10 or 0-9 dice to generate two random 2-digit numbers, which they mark on a beaded line. They compare these pairs of numbers.**

-- Some children identify multiples of 10 that a third random number lies between.

**Day 2 Teaching**Show a quantity of supermarket vouchers and ask children to estimate within a range and to the nearest 10. Model how to count the vouchers efficiently by grouping in 10s, or 5s for smaller numbers.

**Group activities**

-- Children use pasta shapes in mugs to estimate quantities, then count efficiently by grouping into 10s.