51) Bridging Ten Addition

Ten Plus Bonds: Strategy 8+

51.1 Bridging Ten Addition Strategy 8+

Mathematics

Develop the addition strategy of bridging ten, from a part of eight, for whol es up to 20.

For example, 8 + 7

Prior knowledge of part-part-whole, bonds of 10 and place value partitioning using ten plus bonds is needed.

Language

  • bridge ten
  • add
  • equals
  • sum: the total resulting from addition

Differentiation

A little easier

Scaffold: counting order

Calculate each question in counting order, working clockwise around the spinner, from the 12 o’clock position. Do not flick the spinner. Assist students to identify patterns. 

Sequence: step by step

If students have difficulty partitioning the second part, into one plus another part, use an additional block.

For example, to model  8 + 7

Some students find it conceptually easier to first place the 8 and 7 blocks. Then place the 2 and 5 on top of the 7 block. 

  • From a top view they can see the bridging ten partition, 8 + 2 + 5.
  • From a front view they can see the parts of 8 and 7.  

A little harder

Bridging ten addition strategy 18+

Play “Ten Plus Bonds: Bridging Ten Addition Strategy 18+ a little harder”. In this game students have to bridge ten, to twenty, from a part of 18, for wholes up to 30.

51.2 Bridging Ten Addition Strategy 18+ A Little Harder
Reduce Scaffolds

The blocks are a scaffold to support calculation. If students can calculate without some or all of the blocks encourage this. Below is a progression of reducing scaffolding, from most to least support, using bridging ten for 18 + 7.

Progression

In the next activity students generalise bridging 10 to adding a part of 7, 8 or 9. Go to

Activity 52

Ten Plus Bonds: Bridging Ten Addition, Strategy 7, 8, 9+