Approaches and methodologies
 

Special numbers strategy

This strategy looks for numbers that make patterns, for example tens or hundreds

(a)
3
5
7
4
6 +

(b)
37
54
71
42
69 +

(a) 3 and 7 are ten, 6 and 4 are ten, that’s 20; add the 5, this totals 25

(b) older children could group the tens using a mixture of rounding and compatibility, for example 37 and 42 is about 80 …

Estimation skills are essential throughout the strands and at all class levels. These skills can be used in Measures in conjunction with using a known unit, for example nearly a metre, less than a litre, about half a kilogram and in fractions and decimals: close to 0, close to a half, close to 1.