Adding and subtracting using multiples of 10, 100, 1000, 10 000 and 100 000

Maths

1. Use the derived fact '9-6 = 3' to solve 90 000 - 60 000 = ________.

2. Use the make 10 strategy to solve: 160 000 + 60 000 = _________.

3. Use either the derived facts or make 10 strategy to solve: 18 000 - 15 000 =

150 365 people attend an event. 80 000 people leave early. How many people are left?

Which derived fact could help us solve: 14 000 - 9000?

1. Use the 'round and adjust' strategy to solve: 398 + 212.

2. Use the 'find the difference by adding on' strategy to complete the equation: 438 + _____ = 620.

3. Use the 'partitioning for subtraction' strategy to solve: 487 - 134 =

4. Use addition and subtraction to find the missing part of this equation: 124 + ______ + 330 = 754

5. Use addition and subtraction to find the missing part of this equation: 389 + ______ + 421 = 924