Applying and consolidating: Related number facts and appropriate strategies

Maths

Mrs Crane has derived some facts from the following equation: 10 + 3 = 13. Which of the following is NOT correct?

Mrs Crane has derived some facts from the following equation: 2 + 3 = 5. Which of the following is NOT correct?

Which is the most efficient strategy to use to solve the following equation: 2432 + 2438

Which is the most efficient strategy to use to solve the following equation: 5434 - 1996

Which is the most efficient strategy to use to solve the following equation: 4007 - 3991

Mrs Crane has used the strategy round and adjust to solve the following equation: 3567 - 2005 = ... which number should she round?

Mrs Crane has used the strategy round and adjust to solve the following equation: 4997 - 1564 = ... which number should she round?

Which is the most efficient strategy to solve the following equation: 5006 - 4992 =

Which is the most efficient strategy to solve the following equation: 7012 - 6991 =

Which is the most efficient strategy to solve the following equation: 4547 - 1345 =