Estimation and rounding
I can use my knowledge of rounding to routinely estimate the answer to a problem then, after calculating, decide if my answer is reasonable, sharing my solution with others.
MNU 2-01a
Number and number processes
Having determined which calculations are needed, I can solve problems involving whole numbers using a range of methods, sharing my approaches and solutions with others.
MNU 2-03a
I have explored the contexts in which problems involving decimal fractions occur and can solve related problems using a variety of methods.
MNU 2-03b
Strategies for addition – https://classroom.thenational.academy/lessons/strategies-for-addition-6njk4d
Strategies for subtraction – https://classroom.thenational.academy/lessons/strategies-for-subtraction-6mv32d
Applying addition and subtraction – https://classroom.thenational.academy/lessons/applying-addition-and-subtraction-74tp2d
Adjusting addends – https://classroom.thenational.academy/lessons/adjusting-addends-c5gpct
Same sum’ with larger numbers – https://classroom.thenational.academy/lessons/same-sum-with-larger-numbers-ccw68d
Same sum’ with decimals – https://classroom.thenational.academy/lessons/same-sum-with-decimals-6xh3jd
Balancing equations using the ‘same sum’ strategy – https://classroom.thenational.academy/lessons/balancing-equations-using-the-same-sum-strategy-65hkct
Balancing equations using compensation – https://classroom.thenational.academy/lessons/balancing-equations-using-compensation-c4uk8e
Balancing equations: Does the order of addends matter? – https://classroom.thenational.academy/lessons/balancing-equations-does-the-order-of-addends-matter-crw36e
Increasing an addend – https://classroom.thenational.academy/lessons/increasing-an-addend-6mw62c
Decreasing an addend – https://classroom.thenational.academy/lessons/decreasing-an-addend-6wv3at
Solve calculations mentally by relating them to known facts – https://classroom.thenational.academy/lessons/solve-calculations-mentally-by-relating-them-to-known-facts-crt64d
Find an unknown addend – https://classroom.thenational.academy/lessons/find-an-unknown-addend-70vkae
Introduction to same difference – https://classroom.thenational.academy/lessons/introduction-to-same-difference-6tgkac
Same difference in context – https://classroom.thenational.academy/lessons/same-difference-in-context-70w6ac
Use the Language of Minuend, Subtrahend, and Difference – https://classroom.thenational.academy/lessons/use-the-language-of-minuend-subtrahend-and-difference-chgk0d
Transform calculations using the same difference – https://classroom.thenational.academy/lessons/transform-calculations-using-the-same-difference-cdh3ed
Transforming Calculations to Make Them Easier to Solve Mentally – https://classroom.thenational.academy/lessons/practice-transforming-calculations-to-make-them-easier-to-solve-mentally-6mvk6e
Transform a subtraction calculation to make the written algorithm easier to apply – https://classroom.thenational.academy/lessons/transform-a-subtraction-calculation-to-make-the-written-algorithm-easier-to-apply-6guk0t
‘Same Difference’ in Different Contexts – https://classroom.thenational.academy/lessons/practice-same-difference-in-different-contexts-64w3jt
Balancing equations to find unknown values – https://classroom.thenational.academy/lessons/balancing-equations-to-find-unknown-values-6nk3ge
Explore how the difference changes when only the Minuend is changed – https://classroom.thenational.academy/lessons/explore-how-the-difference-changes-when-only-the-minuend-is-changed-6ngk4t
Apply the generalisation about how the minuend and difference change to solve problems – https://classroom.thenational.academy/lessons/apply-the-generalisation-about-how-the-minuend-and-difference-change-to-solve-problems-cdj3cr
Explore how the generalisation can be used as a mental calculation strategy using Known facts – https://classroom.thenational.academy/lessons/explore-how-the-generalisation-can-be-used-as-a-mental-calculation-strategy-using-known-facts-c5gk4c
Thinking flexibly – https://classroom.thenational.academy/lessons/thinking-flexibly-74t3jr
Comparing Strategies – https://classroom.thenational.academy/lessons/comparing-strategies-65k68r
The more we subtract, the less we are left with. The less we subtract… – https://classroom.thenational.academy/lessons/the-more-we-subtract-the-less-we-are-left-with-the-less-we-subtract-65gp4d
Contexts where the Minuend is Kept the Same, and the Subtrahend Increases – https://classroom.thenational.academy/lessons/contexts-where-the-minuend-is-kept-the-same-and-the-subtrahend-increases-6rt3ec
Contexts where the minuend is kept the same, and the Subtrahend decreases – https://classroom.thenational.academy/lessons/contexts-where-the-minuend-is-kept-the-same-and-the-subtrahend-decreases-6rt64r
Further practice to reason about how the change in the subtrahend changes the difference – https://classroom.thenational.academy/lessons/further-practice-to-reason-about-how-the-change-in-the-subtrahend-changes-the-difference-6xh6ac
Explore problems in which the new difference must be found – https://classroom.thenational.academy/lessons/explore-problems-in-which-the-new-difference-must-be-found-6rrpcc
Balance Equations Where the Compensation Property of Same Sum Cannot Efficiently be Applied – https://classroom.thenational.academy/lessons/balance-equations-where-the-compensation-property-of-same-sum-cannot-efficiently-be-applied-ctj3jc
Balance Equations Where the Compensation Property of Same Difference Cannot Efficiently be Applied – https://classroom.thenational.academy/lessons/balance-equations-where-the-compensation-property-of-same-difference-cannot-efficiently-be-applied-c8wk2d
Adding 2 or more numbers mentally – https://classroom.thenational.academy/lessons/adding-2-or-more-numbers-mentally-60u68d
Calculating across zero – https://classroom.thenational.academy/lessons/calculating-across-zero-61hk4d
Adding using the column method – https://classroom.thenational.academy/lessons/adding-using-the-column-method-cmw3cc
Adding using the column method, when multiple columns require regrouping – https://classroom.thenational.academy/lessons/adding-using-the-column-method-when-multiple-columns-require-regrouping-cmwpcr
Subtracting using the column method – https://classroom.thenational.academy/lessons/subtracting-using-the-column-method-6mr38r
Subtracting using the column method, when multiple columns require regrouping – https://classroom.thenational.academy/lessons/subtracting-using-the-column-method-when-multiple-columns-require-regrouping-6xh34c
Applying and consolidating: Column method for addition and subtraction – https://classroom.thenational.academy/lessons/applying-and-consolidating-column-method-for-addition-and-subtraction-cgvpcc
Deriving decimal addition and subtraction facts – https://classroom.thenational.academy/lessons/deriving-decimal-addition-and-subtraction-facts-6gu30c
Adding decimals – https://classroom.thenational.academy/lessons/adding-decimals-70t62r
Subtracting decimals – https://classroom.thenational.academy/lessons/subtracting-decimals-69jpat
Applying mental calculation strategies to adding and subtracting decimals – https://classroom.thenational.academy/lessons/applying-mental-calculation-strategies-to-adding-and-subtracting-decimals-cgr3ce
Solving problems with decimals using addition and subtraction – https://classroom.thenational.academy/lessons/solving-problems-with-decimals-using-addition-and-subtraction-6gu6ad
