125 25 5 125 dividend 25 divisor 5
- Slides: 11
125 ÷ 25 = 5 125 – dividend 25 – divisor 5 - quotient
Chunking is an informal method which is based on our mental process when we do division in our head.
We keep subtracting small JUNKS or MULTIPLES of the divisor. 125 ÷ 25 125 – 25 = 100 – 25 = 75 ….
WALT. Divide an interger by a 2 digit divisor. In order to carry out the chunking division quickly, we need to mentally find the multiples of the divisor.
168 ÷ 14 = 12 14 168 12 Bội số của 14 (Multiples of 14) - 140 28 14 x 10 - 28 0 14 x 2 We highlight the divisor 14 in order to find the multiples of 14 We circle “the times” we multiplied by 14.
416 ÷ 26 = 16 16 26 416 - 260 156 - 130 26 - 26 0 26 x 10 26 x 5 1 We highlight the divisor 26 in order to find the multiples of 26 We circle “the times” we multiplied by 26.
825 ÷ 25 = 33 33 25 825 - 500 325 - 250 75 - 50 25 - 25 0 25 x 20 25 x 10 25 x 2 25 x 1
2912 ÷ 34 = 34 2924 - 680 2244 34 x 20 - 680 34 x 20 1564 884 - 680 - 204 68 Oh! No! 34 x 2
2912 ÷ 34 = 34 2924 - 3400 34 x 100 ÷ 2 - 1700 34 x 50
86 34 2924 - 1700 1224 - 680 2912 ÷ 34 = 34 x 50 34 x 20 34 x 10 34 x 5 34 x 1 544 - 340 204 - 170 34 - 34 86
Remember: Should only use multiples of: • 2, 4, 5, 10, • 20, 40, 50, • 100, 200, … In order to work out the chunks quickly and to avoid careless mistakes when subtracting Skills: Find Doubles and halves
