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Add/subtract numbers bridging 10
In-depth Investigation: Secret Number from nrich.maths.org
Number lines
In-depth investigations:
Y2: 100 Square Jigsaw from nrich.maths.org.
Y3: Reasoned Rounding from nrich.maths.org.
2-digit and 3-digit place value
In-depth investigation Y3:
Round the Three Dice from nrich.maths.org