1 - Patterns - Related Facts/Factors
2 - halving and doubling
3 - Multiplying and multiples of 10.
4 - Estimating products - close and easy.
5 - Mental math - halving and doubling
15 x 7
10 x 7
5 x 7
14 x 5
7 x 10 - Halving and doubling
198 x 5
200 x 5 = 1000 (2 x 5)
1000 - 10 = 990
6 - Multiplying 2 Digit Numbers
Draw a diagram
Expanded form
23 x 32
(20 x 30) + (20 x 2) + (3 x 30) + (3 x 2)
600 + 40 + 90 + 6
= 736
7 - Estimating Quotients to Solve Problems -
675 / 8 =
640 / 8 = 80 720 / 8 = 90
8 - Dividing 3 Digit numbers by 1 digit numbers.
Strategies:
- Base 10 blocks/drawings
- Repeated Subtraction
- Place Value division
9 - Same as 8
10 - Multistep Problems
